experiment 13

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环境化学ppt课件-13、咖啡因、可可豆碱、茶碱的提取—萃取、升华、定性检验(1)

（2）茶碱（1,3-二甲基-2,6-二氧嘌呤）茶叶含微量，白色微小粉末结晶，熔点：373℃，易溶于沸水、微溶于冷水、乙醇。
Байду номын сангаас
2006.09
玉溪师范学院化学与环境科学系柴跃东
4
3、Experiment Reagent and Apparatus
Apparatus： 250mL 烧瓶、锥形瓶、温度计、冷凝管、蒸馏头、布氏漏斗、抽滤瓶、150mlSoxhlet提取器。 Reagent：茶叶、乙醇、生石灰、95% 乙醇、浓盐酸、1% 乙酸。
6、升华过程中要控制好温度。若温度太低，升华速度较慢，若温度太高，会使产物发黄（分解）。
7、刮下咖啡因时要小心操作，防止混入杂质。 schoolwork： 1、升华前加入生石灰起什么作用？ 2、为什么在升华操作中，加热温度一定要控制在被升华物熔点以下？
2006.09 玉溪师范学院化学与环境科学系柴跃东 8
2006.09
玉溪师范学院化学与环境科学系柴跃东
5
4、Experiment Process
1、Process one：synthesize
10g茶叶 Soxhlet , 提取器蒸馏至近干装上回流管稍冷后取下回流管台秤称提取器粗产物 100ml 乙醇回流 2.5h 改装蒸馏装置回收乙醇加沸石 250ml 烧瓶
2、用滤纸包茶叶末时要严实，防止茶叶末漏出堵塞虹吸管；滤纸包大小要合适，既能紧贴套管内壁，又能方便取放，且其高度不能超出虹吸管高度。 3、若套筒内萃取液色浅，即可停止萃取。 4、浓缩萃取液时不可蒸得太干，以防转移损失。否则因残液很粘而难于转移，造成损失。 5、拌入生石灰要均匀，生石灰的作用除吸水外，还可中和除去部分酸性杂质（如鞣酸）。

初一英语科学实验设计单选题40题

初一英语科学实验设计单选题40题1. We need a ____ to measure the temperature in the experiment.A. rulerB. thermometerC. scaleD. compass答案：B。

本题考查科学实验中测量温度的工具词汇。

选项A“ruler”是尺子，用于测量长度；选项C“scale”通常指秤，用于称重；选项D“compass”是指南针，用于指示方向。

只有选项B“thermometer”是温度计，用于测量温度。

2. Before starting the experiment, we should ____ all the materials.A. prepareB. finishC. destroyD. forget答案：A。

本题考查实验前的准备动作词汇。

选项B“finish”是完成；选项C“destroy”是破坏；选项D“forget”是忘记。

而“prepare”有准备的意思，实验前需要准备材料，所以选A。

3. In the science experiment, we ____ the liquid into the beaker carefully.A. pourB. throwC. pushD. pull答案：A。

本题考查向容器中倾倒液体的动词。

选项B“throw”是扔；选项C“push”是推；选项D“pull”是拉。

“pour”有倾倒、灌注的意思，符合将液体倒入烧杯的动作描述，故选A。

4. Which of the following is NOT a step in a science experiment?A. ObservingB. GuessingC. RecordingD. Analyzing答案：B。

本题考查科学实验的步骤词汇。

观察（Observing）、记录（Recording）和分析（Analyzing）都是科学实验中的常见步骤，而猜测 Guessing）不是一个正式的步骤，故选B。

高一英语科技活动单选题30题

高一英语科技活动单选题30题1.In a technology exhibition, we can see many different kinds of _____.A.inventionsB.discoveriesC.creaturesD.products答案：A。

本题主要考查名词辨析。

“inventions”意为发明；“discoveries”意为发现；“creatures”意为生物；“products”意为产品。

在科技展览中，我们能看到很多不同种类的发明。

2.The new software is a great ____ in the field of technology.A.achievementB.advanceC.appearanceD.adventure答案：A。

“achievement”意为成就；“advance”意为前进、进步；“appearance”意为外貌、出现；“adventure”意为冒险。

新软件在科技领域是一个巨大的成就。

3.During the science fair, students presented their _____.A.experimentsB.experiencesC.exercisesD.examples答案：A。

“experiments”意为实验；“experiences”意为经历；“exercises”意为练习；“examples”意为例子。

在科学展览会上，学生们展示他们的实验。

4.Technology has brought many changes to our daily _____.A.livesB.liveC.livingD.lively答案：A。

“lives”是“life”的复数形式，意为生活；“live”可作动词，意为居住、生活等；“living”可作形容词，意为活的、现存的等，也可作名词，意为生计；“lively”是形容词，意为活泼的。

《大学物理实验》教学大纲（SyllabusofCollegePhysicsExperiment）

《大学物理实验》教学大纲（Syllabus of College PhysicsExperiment）Syllabus of College Physics Experiment(for engineering majors)Course number:Course English Name: Physical experiment of CollegeApplicable Specialty: Engineering Department: water conservancy, power, civil engineering, power machinery, medical department (five year) each professionDepartment of information: Surveying and mapping, remote sensing information, computer science, resources and environmental specialtiesSemester: This course takes two semesters (one, two)Class hour: 54 hoursCredits: 1.5Examination: examination scores of the experimental class with grades and final experimental skills examination of two parts: the scores accounted for 70% (including the report and experiment operation examination) accounted for 30% (including experimental operation and experimental results).Lecture room and teaching and research section: Physics Laboratory Center of physical science and Technology College (1), (two)First, the nature, purpose and task of the courseThe university physics experiment in higher school students in basic training of scientific experiment a compulsory basic course, is the beginning to accept system training experimental skills of students entering college, is an important basis for engineering students to conduct scientific experiments and training. It is the practical teaching link that students turn knowledge into ability through their own practice. It plays an important role in cultivating students' ability to observe, discover, analyze and research problems, and ultimately solve problems by means of experiments. Also for students to carry out scientific research independently, the design of experimental programs, selection, use of equipment and put forward new experimental topics; for further study of subsequent experimental courses to lay a good foundation. Its specific tasks are as follows:1, cultivate and improve students' scientific experimental literacy. Asked students to engage in scientific experiments should be conscientious, meticulous and strict working attitude and style of combining theory with practice, study and active exploration spirit, good discipline, unity and cooperation and take good care of public property.2, learn and master the use of experimental principles, methods to study some physical phenomena, conduct specific tests, drawconclusions, deepen the understanding of the principles of physics.3. Cultivate and improve students' ability of scientific experiment:(1) be able to read textbooks and materials, from the purpose of measurement requirements, the correct understanding of the scientific principles on the basis of good preparation before the experiment;(2) the correct selection and use of common instruments and the determination of reasonable experimental procedures can be carried out with the aid of teaching materials and instrument instructions;(3) basic training of experimental skills, familiar with the working principle, structure, performance, adjustment operation, observation, analysis and troubleshooting of common instruments;(4) good at using physics theory, observing the phenomena (general, normal, individual, abnormal) in experiment, and analyzing and judging the experimental phenomena preliminarily;(5) learn the correct recording and processing of experimental data, according to the requirements of drawing curves, the correct expression of the experimental results, writing experiment report qualified and the analysis of experimental methods, measuring instruments, the surrounding environment,the number of measurements and skills to influence the measurement result;(6) the experimental data can be consulted, and the simple design experiment can be done independently.Two, the course before classAdvanced mathematics and general physicsThree, the basic requirements of curriculum teaching1, in experiment teaching and introduces some appropriate physical experiment for students of the historical development, dialectical materialism, the world outlook and methodology of education, to enable students to understand the importance of scientific experiments, clear the course of physical experiment purpose, status, function and task.2, during the experiment, to educate students to develop good habits of experiment, training scientific style, linking theory with practice and realistic serious attitude and take good care of public property, follow the operating rules, abide by the rules of good moral character.3, the experimental introduction class should give students the basic knowledge of measurement error, uncertainty and experimental data processing, requiring students to master and apply in specific experiments,Cultivate students' ability to correctly analyze experimentalerrors and deal with experimental results.4, through the physical experiment system training, require students to do:(1) finish the experiment preparation before the class, write the preview report of the experiment (ask for self made data record form), conduct the experiment operation independently, and write the experiment report after class.(2) master the adjustment and operation technology of common physics experiment instruments. For example: zero calibration; horizontal, vertical balance adjustment; according to the correct circuit wiring diagram is given; the light path and high alignment etc..(3) master the commonly used experimental methods. Such as comparison method, amplification method, conversion measurement method, simulation method, balance method, compensation method, interference method and so on.(4) the measurement of common physical quantities. For example, length (including micro length and its change), angle, mass, time, force, pressure, temperature, heat, current, voltage, electromotive force, resistance, magnetic induction intensity, wavelength, refractive index, etc..(5) familiar with the performance and usage of common instruments. For example: vernier, micrometer, balance, stopwatch, thermometer (including thermocouple), DC voltage meter, current meter, electric meter, flow, pick up thepotentiometer, sliding rheostat, resistance box, universal oscilloscope, low-frequency signal source, reading microscope and telescope, raler reading spectrometer and the common light source (sodium lamp mercury, light and laser) etc..The design of experiments and comprehensive experiments by 5 students to complete a certain amount (including the modern physics experiment, etc.) determined to make students think, in the experimental method of measuring instrument selection and collocation, the measurement conditions by preliminary training.Four, the main content and specific requirements of the curriculumThis course is divided into introduction, basic experiment (60%), comprehensive and modern physics experiment (25%), design experiment four parts (15%). In the specific teaching arrangements, according to the professional situation and the number of hours of the following parts of the appropriate combination of content.Introduction classThe use of multimedia teaching of the introduction lesson form, measurement error and introduces the basic concepts of uncertainty and experimental results, effective digital processing method of uncertainty estimation, the common data, and the basic procedures and requirements. In the first experiment class, teachers divided classes, explained the experimental data, pre processed knowledge and the firstchapter exercises.Part 1 Basic ExperimentsExperiment 1 gravity acceleration measurementBy measuring the acceleration of gravity free fall 2-12-2 the pendulum is used to measure the acceleration of gravityExperiment 2 optical lever method to measure the young's modulus of steel wireMoment of inertia with torsion pendulum test 3 rigid body experimentExperiment 4 Determination of liquid viscosity coefficientThe surface tension coefficient of 5 by adruption measured liquidExperiment 6 Determination of thermal conductivity of poor conductorExperiment 7 sound velocity measurementExperimental 8 volt ampere method for measuring transistor characteristicsExperiment 9 DC bridge and its applicationThe principle and application of experiment 10 oscilloscopeExperiment 11 simulation of electrostatic fieldExperiment 12 alternating current bridgeExperiment 13 resonance of AC circuitExperiment 14 electromagnetic induction method to measure alternating magnetic fieldExperiment 15 Holzer effectExperiment 16 the measurement of the focal length of thin lensThe adjustment and use of spectrometer in experiment 17Application of equal thickness interference in experiment 18Experiment 19 diffraction gratingExperiment 20 analysis of polarized lightThe second part synthesis and modern physics experimentExperiment 21 measuring Young's modulus of metal by dynamic methodExperiment 22 ultrasonic thickness measurementExperiment 23 using nonlinear circuit to study chaoticphenomenaExperiment 24 unbalanced DC bridge and its application Steady state characteristics of RLC circuit in experiment 25 Transient characteristics of RLC circuit in experiment 26Fourier analysis of square wave electrical signals in experiment 27Experiment 28 Michelson interferometerExperiment 29 ultrasonic gratingExperiment 30 holographyExperiment 31 photoelectric effectExperiment 32 Franck Hertz experimentIn experiment 33, Millikan Oil Drop ExperimentExperiment 34 hydrogen atom spectrumThe third part is the design experimentExperiment 35 determination of the density of soluble particles in waterExperiment 36 measuring the volt ampere characteristic curveof small bulbExperiment 37 measuring the resistance of a given resistance wireExperiment 38 measuring resistance with potential difference meterIn experiment 39, the electromotive force and internal resistance of dry cell were measured by potential difference meterExperiment 40 modification and correction of ammeterExperiment 41 measuring the temperature coefficient of metal resistanceExperiment 42 design and manufacture of small power stabilized voltage power supplyExperiment 43 measuring the temperature characteristics of PN junction temperature sensorDesign and manufacture of digital thermometer in experiment 44Experiment 45 measuring the hysteresis loop of ferromagnetic materials by oscilloscopeExperiment 46 using Holzer device to measure the horizontal component of geomagnetic fieldExperiment 47 synthetic measurement of refractive index of optical materialsAssembly of internal focusing telescope in experiment 48 and determination of magnificationExperiment 49 measuring tiny length by Moire fringeFabrication of holographic grating in experiment 50In experiment 51, the light wavelength of sodium was measured by laser speckle photographyExperiment 52 measurement of optical fiber characteristic parametersExperiment 53 fiber optic temperature sensorExperiment 54 the application of computer in physics experimentLaser Doppler frequency shift measurementFive, teaching implementation and main contentEmphasis on experimental methods is a very important means of scientific research, such as comparative methods, amplification method, conversion measurement method, simulation method, compensation method and interference method used in physics experiments. Make the students realize the importance and necessity of the experiment course. In class, we should use questions and speeches, and take the students'independent operation as the main teaching method. In the course of teaching, we should consciously carry out the education of dialectical materialism and scientific methodology, and appropriately introduce some historical materials of physical experiments.The specific approach is strictly three:Good preview. Before class prepare to inform students to do experiment preparation, put forward request, teachers should check the students' Preview report before the students enter the lab, asked a sample preview the degree and effect of some experimental principle, the use of the equipment, operation steps, measurement of the content, check the students for individual students.Seriously guide the experiment. Before the operation, the teacher first teaches the basic principles of the experiment (theory and formula), the operation essentials and the basic requirements in the experiment, and puts forward the matters needing attention. The whole experiment process is the most active and the most important stage for students, and teachers should seize the opportunity to conduct on-the-spot instruction. With the elicitation method, cultivating students' independent thinking, independent operation, independent observation, analysis and problem solving ability; check the students' operation and reading correctly, guide the students to observe the experiment phenomenon of contact theory, make a rational analysis, and requires students to exclude the general fault, teachers do not require students to engage in rigorous acting on their behalf, students should cherisheducation, strict in demands, equipment, comply with laboratory rules, through the experiment, cultivate students' attitude is rigorous, careful, realistic, bold exploration, scientific experiments style of thinking, teacher to student questions to answer patiently. In the experiment, the student's measurement data should be signed by teachers, and the equipment should be cleaned so that they can leave the laboratory.To read the reports. First check whether the original data with the experiment report (by teacher signature, analysis and preview report) discuss the processing accuracy and data seriouslycritiqued experimental results, experimental report requirements of standardization requirements shall be clean and neat handwriting, with test report sheet. Check the ability of students to properly handle the experimental data (such as the effective number of application and operation, error analysis, the correct expression, curve drawing, answer questions or specify teacher questions) according to the comprehensive score, the experiment report no original data to be eligible.In addition to the normal arrangement of experimental extracurricular activities, we also actively create conditions to expand open experimental projects. This will enable students to use their spare time to prepare and prepare for the laboratory. In order to improve students' interest in physics experiments, and be familiar with the equipment and instruments, as well as the surrounding environment.Setting up designing experiment further.According to the equipment condition and teachers' strength in this room, we can set up the design experiment items. First of all, the questions and requirements are put forward by the teacher, and then the experiment is completed by the students themselves (including the principle, the choice of the instrument, the design of the circuit or light path, the means of operation, etc.). The teacher only serves as a supplementary guide. Designing experimental items is of great benefit to the cultivation of students' ability to think independently, to practice and to handle problems by themselves, which is of great benefit to the initiative to explore the spirit.Some experimental questions require students to use the microcomputer to process the data on the spot and exercise the ability of using computers.Six. Distribution of reference hoursIntroduction class (3 hours), basic experiment (30 hours), comprehensive and Modern Physics (12 hours), design experiment (9 hours)Seven, teaching materials and reference booksZhou Dianqing edited the college physics experiment course, Wuhan University press, January 2005Edited by Pan Shouqing, college physics experiment, Dalian Maritime University press, February 1998Ma Qingmao edited the physics experiment course, Wuhan University of Surveying and Mapping Press, January 1999Shen Yuanhua, Lu Shenlong, editor of basic physics experiment, higher education press, March 2003.College of physical science and technology, Wuhan UniversityPhysics Experiment Center2005.2 revisionOne。

九年级英语月考试题

九年级英语月考试题一、单项选择（每题1分，共10分）1. -I don't know how to use this app.-Ask Kitty for help. She has lots of ____ in doing it.A. expression.B. experiment.C. examination.D. experience.答案：D。

解析：句意为“我不知道如何使用这个应用程序。

”“向基蒂寻求帮助。

她在这方面有很多经验。

”experience表示“经验”，是不可数名词；expression“表达；表情”；experiment“实验”；examination“考试；检查”，所以选D。

2. -____ have you been in this school?-For three years.A. How far.B. How long.C. How often.D. How soon.答案：B。

解析：根据答语“For three years.”（三年了），这是一段时间，对时间段提问要用how long，how far对距离提问；how often对频率提问；how soon对“in + 一段时间”提问，表示“多久之后”，所以选B。

3. The movie is so interesting that I don't ____ seeing it again tomorrow.A. enjoy.B. mind.C. keep.D. finish.答案：B。

解析：句意为“这部电影如此有趣，我不介意明天再看一次。

”mind doing sth.表示“介意做某事”；enjoy doing sth. “喜欢做某事”；keep doing sth. “一直做某事”；finish doing sth. “完成做某事”，根据语境选B。

4. -Could you tell me ____?-Sure. Just go straight and turn left. You can see it on your right.A. how can I get to the library.B. where is the library.C. how I can get to the library.D. where the library was.答案：C。

experiment results和experimental results -回复

experiment results和experimental results -回复问题并解释这两个术语之间的区别。

文章应包括以下内容：1. 引言：介绍实验结果和实验结果术语的重要性和使用范围。

2. 实验结果的定义：解释实验结果的含义和来源。

3. 实验结果的目的：描述实验结果的主要目的和用途。

4. 实验结果的组成部分：介绍实验结果的主要组成部分，如数据、图表和文字描述。

5. 实验结果的展示和解释：讨论如何展示和解释实验结果以便于理解和分析。

6. 实验结果的验证和重复性：解释实验结果的验证过程和重复性的重要性。

7. 实验结果与实验结果的区别：区分实验结果和实验结果术语之间的差异并解释其使用场景和含义。

8. 结论：总结实验结果和实验结果术语的重要性，并强调实验结果的有效展示和解释对于科学研究的重要性。

以下是一份参考文章：标题：实验结果和实验结果术语：定义、目的和区别的解释引言：实验结果和实验结果术语是科学研究中非常重要的概念。

它们帮助研究人员有效地记录、分析和解释实验数据，并为其他研究人员提供复制实验的基础。

在本文中，我们将探讨实验结果和实验结果术语的定义、目的以及它们之间的区别，并强调实验结果的有效展示和解释对于科学研究的重要性。

实验结果的定义：实验结果是指在科学实验中观察到的现象、测量到的数据或得出的结论。

这些结果可以通过各种方法获得，例如测量、观察、计算或实验操作的输出。

实验结果是研究人员根据实验过程的实际结果来描述和解释的数据，这些数据可以用于验证或推翻假设。

实验结果的目的：实验结果的主要目的是提供对实验得出的结论、观察或测量的描述和解释。

实验结果的目的是帮助其他研究人员理解实验过程中所观察到的现象，并在进一步的研究中重复实验。

此外，实验结果还可以用于验证或推翻原始假设，并为其他研究提供依据和参考。

实验结果的组成部分：实验结果通常由以下几个主要组成部分构成：1. 数据：实验数据是实验过程中记录的数值、测量结果或观察到的现象。

高二英语实验设计单选题30题

高二英语实验设计单选题30题1. The first step in the experiment is to ______ the equipment carefully.A. checkB. checksC. checkedD. checking答案：A。

本题考查动词不定式。

to 后面接动词原形，B 选项checks 是第三人称单数形式，C 选项checked 是过去式，D 选项checking 是现在分词，均不符合to do 结构，所以选A。

2. Before starting the experiment, you should ______ all the materials are ready.A. make sureB. make sure ofC. be sureD. be sure of答案：A。

make sure 后接宾语从句，make sure of 后接名词或代词。

本题后面接的是宾语从句all the materials are ready，所以用make sure，B、D 选项不符合；C 选项be sure 表示“确信”，其后不接宾语从句，所以选A。

3. During the experiment, you need to ______ the temperature of the solution constantly.A. measureB. measuresC. measuredD. measuring答案：A。

need to do sth. 表示“需要做某事”，to 后接动词原形，B 选项measures 是第三人称单数形式，C 选项measured 是过去式，D 选项measuring 是现在分词，均不符合，所以选A。

4. When you finish the experiment, remember to ______ the data accurately.A. recordB. recordsC. recordedD. recording答案：A。

做一个实验的英文

做一个实验的英文基本上每一节化学课老师都会做至少一个实验，因为有趣所以大家都很喜欢化学课。

下面小编为大家带来做一个实验的英语意思和相关用法，欢迎大家一起学习!做一个实验的英语意思make an experiment做一个实验的相关英语例句1. We should like to do another experiment.我们倒是很想再做一个实验.2. So, let's try thought experiment.那么, 我们来做一个实验.3. Be It'so late, I must do another experiment.时间虽晚, 但我必须再做一个实验.4. We are doing an experiment this week.我们本星期在做一个实验.5. Now, you can proceed to the next one.现在, 我们再来做一个实验.6. We made an experiment to explain air pressure.我们做过一个实验来解释空气的压力.7. No matter how late it is, I must do another experiment.不管时间很晚, 但我必须做另一个实验.8. In 20XX年, he performed another experiment that chilled the blood of trendologists.20XX年, 他做了另外一个实验给流行专家们泼了冷水.9. Our demand is that another experiment should be made.我们的要求是做另一个实验.10. I did one experiment and in the end I succeeded.我做了一个又一个实验,最后我成功了.11. Today, I and Jeanne have done a experiment together.今天, 我和珍妮一起做了一个实验.12. He tried one experiment after another.他做了一个实验又一个实验.13. I am doing an experiment of neutralizing acid.我在做一个中和酸的实验.14. We expressed the hope that we should another chance to do the experiment.我们表达了一个愿望,希望再有一次机会去做那个实验.15. In class, we are doing an experiment on the effect of light on plants.在课堂上, 我们要做一个关于光对植物作用的实验.做一个实验的英文例句能够实现这个目的的方法是做一个实验。

allen试验的操作基本流程

allen试验的操作基本流程1.首先，准备实验所需的材料和设备。

First, prepare the materials and equipment needed for the experiment.2.然后，按照实验步骤依次进行操作。

Then, follow the experimental steps to operate sequentially.3.将实验样品放置在试验器具中。

Place the experimental sample in the test apparatus.4.测量并记录样品的初始数据。

Measure and record the initial data of the sample.5.开始对样品进行实验处理。

Start the experimental treatment of the sample.6.观察样品的变化并记录下来。

Observe the changes of the sample and record them.7.在实验过程中，严格按照安全操作规程进行。

During the experiment, strictly follow the safety operating procedures.8.如果需要调整实验条件，及时进行调整。

If necessary, adjust the experimental conditions in time.9.在实验完成后，整理和记录实验数据。

After the experiment is completed, organize and record the experimental data.10.进行实验结果的分析和总结。

Conduct analysis and summary of the experimental results.11.实验使用的设备需要进行清洁和消毒。

The equipment used in the experiment needs to be cleaned and disinfected.12.实验结束后将材料和设备归置到原处。

氢在铜电极上析出反应计划曲线

氢在铜电极上析出反应计划曲线1.实验目的是在铜电极上观察氢的析出反应。

The purpose of the experiment is to observe the hydrogen evolution reaction on the copper electrode.2.首先准备一定浓度的氢酸溶液。

First, prepare a certain concentration of sulfuric acid solution.3.将铜电极清洗干净并放入酸溶液中。

Clean the copper electrode and place it in the acid solution.4.设置实验时间，例如10分钟。

Set the experiment time, for example, 10 minutes.5.开始记录反应过程中氢的生成情况。

Start recording the hydrogen generation during the reaction.6.在反应过程中观察氢气气泡的生成。

Observe the generation of hydrogen gas bubbles during the reaction.7.记录铜电极表面的气泡数量。

Record the number of bubbles on the surface of the copper electrode.8.每隔一分钟记录一次氢气气泡数量。

Record the number of hydrogen gas bubbles every minute.9.观察气泡的大小和频率。

Observe the size and frequency of the bubbles.10.确保实验环境的稳定性。

Ensure the stability of the experimental environment.11.将实验数据整理成曲线图。

中考英语科学实验练习题40题

中考英语科学实验单选题40题1.The instrument used to measure temperature is _____.A.rulerB.thermometerC.balanceD.telescope答案：B。

“ruler”是尺子，用来测量长度；“thermometer”是温度计，用来测量温度；“balance”是天平，用来测量物体质量；“telescope”是望远镜，用于观测远处物体。

题目中问测量温度的仪器，所以答案是thermometer。

2.The tool for observing small objects is _____.A.microscopeB.cupC.penD.book答案：A。

“microscope”是显微镜，用于观察微小物体；“cup”是杯子；“pen”是钢笔；“book”是书。

题目中问观察小物体的工具，所以答案是microscope。

3.The equipment used to measure mass is _____.A.scaleB.clockpassmp答案：A。

“scale”是秤，用来测量质量；“clock”是时钟；“compass”是指南针；“lamp”是灯。

题目中问测量质量的设备，所以答案是scale。

4.The instrument for measuring length is _____.A.tape measureB.magnifying glassC.flaskD.microphone答案：A。

“tape measure”是卷尺，用于测量长度；“magnifying glass”是放大镜；“flask”是烧瓶；“microphone”是麦克风。

题目中问测量长度的仪器，所以答案是tape measure。

5.The tool for holding test tubes is _____.A.test tube holderB.pencilC.eraserD.scissors答案：A。

高一英语化学积累单选题50题

高一英语化学积累单选题50题1. The chemical symbol for sodium is ____.A. NaB. SoC. SD. N答案解析：A。

在化学中，“sodium”（钠）的化学符号是“Na”，这是国际通用的化学符号表示法。

选项B“So”不是钠的化学符号；选项C“S”是硫（sulfur）的化学符号；选项D“N”是氮（nitrogen）的化学符号。

2. Which of the following is the English name for “水” in a chemical sense?A. OxygenB. HydrogenC. WaterD. Carbon dioxide答案解析：C。

在化学中，“水”的英文是“Water”，其化学式为H₂O。

选项A“Oxygen”是“氧”；选项B“Hydrogen”是“氢”；选项D“Carbon dioxide”是“二氧化碳”。

3. The chemical formula for hydrochloric acid is ____.A. HClB. H₂SO₂C. NaOHD. CaCO₂答案解析：A。

“hydrochloric acid”（（盐酸）的化学式是“HCl”。

选项B“H₂SO₂”是硫酸的化学式；选项C“NaOH”是氢氧化钠的化学式；选项D“CaCO₂”是碳酸钙的化学式。

4. “Carbon” in English refers to which chemical element?A. 铁B. 碳C. 铜D. 锌答案解析：B。

“Carbon”的中文是“碳”，是一种化学元素。

选项A“铁”对应的英文是“iron”；选项C“铜”对应的英文是“copper”；选项D“锌”对应的英文是“zinc”。

5. Which of the following substances is a gas at room temperature?A. IronB. WaterC. OxygenD. Salt答案解析：C。

高一英语非谓语动词特殊用法单选题40题

高一英语非谓语动词特殊用法单选题40题1. ______ is a good way to keep fit.A. RunningB. RunC. RunsD. Ran答案：A。

本题考查非谓语动词作主语。

动词作主语要用动名词形式，A 选项Running 是动名词，B 选项Run 是动词原形，C 选项Runs 是动词第三人称单数形式，D 选项Ran 是过去式，所以选择A。

2. I enjoy ______ books in my spare time.A. readB. readingC. to readD. reads答案：B。

本题考查非谓语动词作宾语。

enjoy 后面接动名词作宾语，A 选项read 是动词原形，C 选项to read 是动词不定式，D 选项reads 是动词第三人称单数形式，所以选择B。

3. She doesn't like ______ late.A. beB. to beC. beingD. is答案：C。

本题考查非谓语动词作宾语。

like 后面可以接动名词或动词不定式作宾语，like doing 表示习惯性的喜欢，like to do 表示一次性的喜欢。

根据题意，这里表示不喜欢迟到这种习惯，所以用动名词，A 选项be 是动词原形，D 选项is 是动词第三人称单数形式，所以选择C。

4. We decided ______ for a picnic.A. goB. to goC. goingD. goes答案：B。

本题考查非谓语动词作宾语。

decide 后面接动词不定式作宾语，A 选项go 是动词原形，C 选项going 是动名词，D 选项goes 是动词第三人称单数形式，所以选择B。

5. His hobby is ______ stamps.A. collectB. collectingC. to collectD. collects答案：B。

本题考查非谓语动词作表语。

八年级英语学科工具名称练习题30题

八年级英语学科工具名称练习题30题1.In math class, the teacher asked us to draw a straight line with a _____.A.rulerB.pencilC.eraserD.crayon答案：A。

选项A“ruler”是尺子，可用来画直线。

选项B“pencil”是铅笔，主要用来写字或画画，但不是专门画直线的工具。

选项C“eraser”是橡皮，用于擦除。

选项D“crayon”是蜡笔，用于画画。

2.We need to measure the length of a line segment. We can use a _____.passB.protractorC.rulerD.pencil sharpener答案：C。

选项A“compass”是圆规。

选项B“protractor”是量角器。

选项C“ruler”尺子可以测量线段长度。

选项D“pencil sharpener”是削笔刀。

3.When we want to draw a circle, we can use a _____.A.rulerB.pencilpassD.eraser答案：C。

选项A“ruler”尺子是画直线和测量的工具。

选项B“pencil”铅笔主要用于写字画画。

选项C“compass”圆规用来画圆。

选项D“eraser”橡皮用于擦除。

4.To measure angles, we use a _____.A.rulerB.pencilC.protractorD.eraser答案：C。

选项A“ruler”尺子测量长度。

选项B“pencil”铅笔写字画画。

选项C“protractor”量角器测量角度。

选项D“eraser”橡皮擦除。

5.In math class, we use a _____ to write down our answers.A.penB.pencilC.eraserD.ruler答案：B。

小学上册第十三次英语第四单元期中试卷

小学上册英语第四单元期中试卷英语试题一、综合题(本题有100小题，每小题1分，共100分.每小题不选、错误，均不给分)1.The skunk has a strong _________. (气味)2.My mom loves to plant ______ in the garden.3.What do we call the time of year when flowers bloom?A. SpringB. SummerC. FallD. Winter4.The __________ (历史的启示) guides our actions.5.The clock is ________ ticking.6.The ________ (presentation) was engaging.7.The Milky Way has a supermassive black hole at its ______.8.My sister loves __________ (参与社区服务).9.Jupiter has a very strong ______ field.10.The ancient Egyptians used ________ to construct their pyramids.11.What do we call a large body of fresh water?A. OceanB. SeaC. LakeD. River答案:C12.I see a ___ (car/train) on the road.13.What do we call a person who writes stories?A. AuthorB. ArtistC. MusicianD. Actor答案:A14.Which of these animals can fly?A. CowB. HorseC. BirdD. Cat答案:C15.My brother is a ______. He enjoys playing the drums.16.She is drawing a _____ (cat/dog) in her notebook.17.I enjoy learning about science experiments. They show us how things work in our world. One experiment I found exciting was __________ because it demonstrated__________.18.What is the term for the distance light travels in one year?A. Light-YearB. Astronomical UnitC. ParsecsD. Cosmic Yard19.I have a toy ________ that can walk.20.What do you call a story that teaches a lesson?A. FableB. NovelC. PoemD. Drama答案:A21.The boiling point of water is _____ degrees Celsius.22.The _______ of a plant can be different shapes.23.We go to school _____ (in/on) the morning.24. A ______ is a geological feature that can provide insights into the past.25.My cousin is a ______. She loves to create content.26.My dad is a __________ (公共关系经理).27.What is the main ingredient in salad?A. BreadB. VegetablesC. CheeseD. Meat答案:B28.The weather is _____ (sunny/cloudy) today.29.What is the capital of Finland?A. HelsinkiB. OsloC. StockholmD. Reykjavik答案:A30.I have a _____ (弹珠) collection that I keep in a jar. 我有一个弹珠收藏，放在一个罐子里。

五年级英语科学实验报告练习题20题含答案解析

五年级英语科学实验报告练习题20题含答案解析1.I ______ the experiment carefully.A.doB.makeC.doesD.makes答案解析：A。

“do the experiment”是固定搭配，表示“做实验”。

B 选项“make”通常用于“make sth”，不用于“make the experiment”；C 选项“does”是第三人称单数形式，这里主语是“I”，不合适；D 选项“makes”也是第三人称单数形式且“make the experiment”搭配错误。

2.First, I ______ the materials.A.prepareB.preparesC.preparedD.preparing答案解析：A。

这里描述的是一般现在时的动作，主语是“I”，用动词原形“prepare”。

B 选项是第三人称单数形式；C 选项是过去式；D 选项是现在分词，都不符合此处语境。

3.Then, I ______ the water into the beaker.A.pourB.poursC.pouredD.pouring答案解析：A。

同样是描述一般现在时的动作，主语是“I”，用动词原形“pour”。

B 选项是第三人称单数形式；C 选项是过去式；D 选项是现在分词，不合适。

4.Next, I ______ the thermometer into the water.A.putB.putsC.puttedD.putting答案解析：A。

“put”的过去式还是“put”，这里描述一般现在时，主语是“I”，用动词原形“put”。

B 选项是第三人称单数形式；C 选项形式错误；D 选项是现在分词，不符合要求。

5.I ______ the temperature of the water.A.measureB.measuresC.measuredD.measuring答案解析：A。

运动负荷试验操作流程

运动负荷试验操作流程1.进行运动前的常规检查，确保身体状况良好。

Carry out routine checks before exercising to ensure good physical condition.2.测量基础生命体征，包括心率、血压和呼吸频率。

Measure basic vital signs, including heart rate, blood pressure, and respiratory rate.3.确认被测试者没有任何不适或健康问题。

Ensure that the subject has no discomfort or health problems.4.让被测试者穿上适合的运动装备和鞋子。

Have the subject wear appropriate sportswear and shoes.5.让被测试者进行适当的热身活动，以准备进行运动。

Have the subject perform appropriate warm-up exercises to prepare for the test.6.安排被测试者进行所需的运动项目，例如跑步、骑车或游泳。

Arrange for the subject to perform the required exercise, such as running, cycling, or swimming.7.在运动过程中监测被测试者的心率和呼吸情况。

Monitor the subject's heart rate and respiration during exercise.8.记录运动过程中被测试者的感觉和表现。

Record the subject's feelings and performance during exercise.9.在运动结束后，让被测试者进行适当的散步和放松活动。

After the exercise, have the subject do appropriate walking and relaxation activities.10.测量运动后的生命体征，如心率恢复时间和血压变化。