Roger11规则英语题库+

[5482]High pressure and low pressure alarms must be tested ______.
A. no earlier than 24 hours prior to loading
B. no later than 24 hours prior to loading
C. anytime prior to loading
D. weekly
KEY: A
[5483]Horizontal subdivision decks forming watertight compartments in the columns of a semisubmersible ship increase the unit's ______.
A. tank capacities
B. stability in the event of damage
C. towing speed
D. anchor holding ratio
KEY: B
[5484]Hot air can hold ______.
A. less moisture than cold air
B. more moisture than cold air
C. the same amount of moisture as cold air
D. moisture independent of air temperature
KEY: B
[5485]How are riveted lap joints made watertight?
A. The faying surfaces are coated with white lead (or similar product) before the rivets are set.
B. A sealing weld bead of 1/8" or less pitch is run along the plate edge.
C. The plate edge is split close to an adjacent plate and mechanically forced into contact with the adjacent plate.
D. A properly riveted joint will be watertight; any leakage is stopped by setting up on the rivets.
KEY: C
[5486]How can the Coast Guard determine that a crew member is "able to understand any order spoken by the officers"?
A. Require a demonstration by the officer and the crew member
B. Require a written test
C. Require that an interpreter be provided
D. All of the above
KEY: A
[5487]How can you estimate the position of a tropical storm's center?
A. With a radio weather bulletin or weather fax
B. using shipboard radar
C. observe the wind direction and apply Buys Ballot's law
D. All of the above
KEY: D
[5488]How could lashing gear used aboard Ro-Ro vessels be stowed when not in use?
A. Drape along brackets
B. Hang vertically in a sheltered area
C. Stow in bins at hatch coming side
D. All of the above
KEY: D
[5489]How do the height and location of a tug's towing bitts relate to the danger of tripping?
A. The further forward and closer to amidships the more readily the tug will trip.
B. Placement further aft permits more effective pulling，better steering and eliminates the danger of tripping.
C. Installing the bitts down low lowers the center of gravity.
D. The height and position of towing bitts has no significance. KEY: A
[5490]How do you determine the weight of the vessel that is supported by the ground when a vessel has run aground?
A. This requires extensive calculation and is usually performed only by a naval architect not by a ship's officer.
B. Determine the point where aground and the draft at that point，then calculate it using the grounding formula.
C. Use the hydrostatic tables and enter with the mean draft before grounding and the mean draft after grounding.
D. Use the inclining experiment formula and substitute the change of trim for the angle of list.
KEY: C
[5491]How do you operate a portable CO2 fire extinguisher?
A. Point the horn down.
B. Turn cylinder upside-down.
C. Break the rupture disc.
D. Pull pin，squeeze grip.
KEY: D
[5492]How does a coast radio station communicating by HF radio normally identify itself?
A. By its subscriber number
B. By its call sign
C. By its MMSI
D. By its MID
KEY: B
[5493]How does a vessel's rate of turn change when entering shallow water?
A. It is faster.
B. It is slower.
C. There is no change.
D. It remains constant for varying propeller revolutions.
KEY: C
[5494]How does an icebreaker normally free a ship which has become beset while navigating independently?
A. By backing down the track and cutting out ice on either bow
B. By approaching from the stern and crossing ahead at an angle of 20°to 30°to the beset ship's course
C. By overtaking the beset ship，running ahead and then backing down the track to the beset vessel
D. By approaching the vessel from astern and towing the beset vessel stern first
KEY: B
[5495]How does foam extinguish an oil fire?
A. By cooling the oil below the ignition temperature
B. By removing the fuel source from the fire
C. By excluding the oxygen from the fire
D. By increasing the weight of the oil
KEY: C
[5496]How does the effect known as "bank suction" act on a single-screw vessel proceeding along a narrow channel?
A. It pulls the stern toward the bank.
B. It heels the vessel toward the bank.
C. It pushes the entire vessel away from the bank.
D. It pulls the bow toward the bank.
KEY: A
[5497]How is a navigation light identified on an Army Corps of Engineers navigation map?
A. Name and light characteristic
B. Name and miles from a reference point
C. Light characteristic and miles A.H.P.
D. None of the above
KEY: B
[5498]How is a safe water mark，that can be passed close aboard on either side，painted and lighted?
A. Black and white stripes with an interrupted quick flashing light
B. Black and red stripes with a Morse (A) light
C. Black and red stripes with an interrupted quick flashing light
D. Red and white stripes with a Morse (A) light
KEY: D
[5499]How is the annual rate of change for magnetic variation shown on a pilot chart?
A. Gray lines on the uppermost inset chart
B. Red lines on the main body of the chart
C. In parenthesis on the lines of equal magnetic variation
D. Annual rate of change is not shown.
KEY: A
[5500]How is the external flotation bladder of an immersion suit inflated?
A. It is inflated by a small CO2 bottle that is automatically tripped when the front zipper is at the top of the zipper track.
B. It is inflated by a small CO2 bottle that is manually tripped.
C. It is inflated by blowing through an inflation tube.
D. It inflates by seawater bleeding into the inflation bladder and reacting with a chemical.
KEY: C
20.8 船舶稳性资料
[5501]Inclination of the vessel to port side or starboard side defines ______.
A. Tip
B. Capsize
C. List
D. Trim
KEY: C
[5502]Initial stability is indicated by ______.
A. GM
B. KM
C. Deck load
D. Maximum allowed KG
KEY: A
[5503]Increasing the number of slack liquid tanks has the effect of raising the ______.
A. uncorrected KG
B. maximum allowed KG
C. virtual height of the center of gravity
D. metacentric height
KEY: C
[5504]Increasing free surfaces has the effect of raising the ______.
A. uncorrected KG
B. virtual height of the center of gravity
C. metacenter
D. metacentric height
KEY: B
[5505]In the presence of external forces，the center of buoyancy of an inclined vessel is vertically aligned with the ______.
A. center of gravity
B. metacenter
C. center of flotation
D. keel
KEY: B
[5506]In small-angle stability，when external forces exist，the buoyant force is assumed to act vertically upwards through the center of buoyancy and through the ______.
A. center of gravity
B. center of flotation
C. metacenter
D. metacentric height
KEY: C
[5507]In small angle stability，the metacentric height ______. A. is found in the hydrostatic tables for a level vessel
B. multiplied by the displacement yields the righting moment
C. is always positive
D. is calculated by subtracting KG from KM
KEY: D
[5508]For small angles of inclination，if the KG were equal to the KM，then the vessel would have ______.
A. positive stability
B. negative stability
C. neutral stability
D. maximum stability
KEY: C
[5509]For a vessel with transverse inclination，an increase in GMT causes ______.
A. list to stabilize at an angle of loll
B. list to decrease
C. trim to decrease
D. list to increase
KEY: B
[5510]For a floating vessel，the result of subtracting KG from KM is the ______.
A. height of the metacenter
B. height of the righting arm
C. height of the center of buoyancy
D. metacentric height
KEY: D
[5511]For a floating vessel，the center of buoyancy and the metacenter are in the line of action of the buoyant force ______.
A. only when there is positive stability
B. only when there is negative stability
C. only when there is neutral stability
D. at all times
KEY: D
[5512]Deballasting a double bottom has what affect on KG? ______.
A. KG is increased.
B. KG is decreased.
C. KG is not affected.
D. KG increases at light drafts and decreases at deep drafts.
KEY: A
[5513]A wind has caused a difference between drafts starboard and port. This difference is ______.
A. list
B. heel
C. trim
D. flotation
KEY: B
[5514]Which of the following is the reason that the metacentric height is a valid measure of only the initial stability？______.
A. The metacenter does not remain in the same position for large angles of inclination．
B. The center of gravity shifts due to inclination．
C. The center of gravity shifts above the metacenter as the vessel is inclined．
D. The mean draft will change as the vessel is inclined
KEY: A
[5515]What is MTI？______.
A. The foot／tons needed to trim the vessel by 1 inch．
B. The foot／tons needed to trim the vessel by 1 foot．
C. The moments needed to trim the vessel by 1 centimeter．
D. The amount of vessel will trim when loading 100 tons 100 feet from the tipping Center
KEY: A
[5516]At all angles of inclination，the metacenter is ______.
A. vertically above the center of buoyancy
B. vertically above the center of gravity
C. at the intersection of the upright vertical centerline and the line of action of the buoyant force
D. at the geometric center of the underwater volume
KEY: A
[5517]An upright vessel has negative GM. GM becomes positive at the angle of loll because the ______.
A. free surface effects are reduced due to pocketing
B. KG is reduced as the vessel seeks the angle of loll
C. effective beam is increased causing BM to increase
D. underwater volume of the hull is increased
KEY: C
[5518]An unstable upright equilibrium position on a vessel means that the metacenter is ______.
A. lower than the center of gravity
B. at the same height as the center of gravity
C. higher than the baseline
D. on the longitudinal centerline
KEY: A
[5519]All of the following can be determined by use of a stabilogauge EXCEPT ______.
A. metacentric height
B. mean draft
C. moment to trim one inch
D. deadweight
KEY: C
[5520]A vessel's KG is determined by ______.
A. dividing the total longitudinal moment summation by displacement
B. dividing the total vertical moment summation by displacement
C. multiplying the MT1 by the longitudinal moments
D. subtracting LCF from LCB
KEY: B
[5521]A serious loss of reserve buoyancy resulting from flooding any compartment of a ship will always ______.
A. increase the trim
B. change the free surface effect
C. cause a serious list
D. decrease ship stability
KEY: D
[5522]A floating vessel will behave as if all of its weight is acting downward through the ______.
A. center of gravity
B. center of buoyancy
C. center of flotation
D. metacenter
KEY: A
[5523]A continual worsening of the list or trim indicates ______.
A. negative GM
B. progressive flooding
C. structural failure
D. an immediate need to ballast
KEY: B
[5524]The original equilibrium position is stable when ______.
A. metacentric height is positive
B. metacentric radius is positive
C. KG exceeds maximum allowable limits
D. free surfaces are excessive
KEY: A
[5525]If the cause of severe list or trim is off-center ballast，counterflooding into empty tanks will ______.
A. increase the righting moment
B. increase the righting arm
C. increase list or trim
D. decrease list or trim
KEY: D
[5526]Semisubmersibles A and B are identical. However，A is more tender than B. This means that A relative to B has a ______.
A. lower KG
B. smaller GM
C. smaller roll angle
D. larger GZ
KEY: B
[5527]The geometric center of the waterplane area is called the ______.
A. center of buoyancy
B. center of gravity
C. metacenter
D. center of flotation
KEY: D
[5528]The maximum length allowed between main，transverse bulkheads on a vessel is referred to as the ______.
A. floodable length
B. factor of subdivision
C. compartment standard
D. permissible length
KEY:
[5529]For a ship with longitudinal inclination，an increase in GML causes ______.
A. list to stabilize at an angle of loll
B. trim to stabilize at an angle of loll
C. trim to increase
D. trim to decrease
KEY: D
[5530]Forces within a vessel have caused a difference between the starboard and port drafts. This difference is called ______.
A. list
B. heel
C. trim
D. flotation
KEY: A
[5531]The height of the metacenter above the keel will vary depending on the ______.
A. draft and beam of the ship
B. displacement and deadweight of the ship
C. buoyancy and trim of the ship
D. tonnage and deadweight of the ship
KEY: A
[5532]______ refers to the tendency of a body of the ship to return to its original position after it is displaced therefrom．
A. Stability
B. Responsibility
C. Liability
D. Visibility
KEY: A
[5533]______ we have worked out the loading plan，we shall start doing more revision work．
A. For now
B. Ever since
C. Now that
D. By now
KEY: C
[5534]A continual worsening of the list or trim indicates ______.
A. negative GM
B. progressive flooding
C. structural failure
D. an immediate need to ballast
KEY: B
[5535]A floating vessel will behave as if all of its weight is acting
downward through the ______.
A. center of gravity
B. center of buoyancy
C. center of flotation
D. metacenter
KEY: A
[5536]A load line of a ship is assigned by ______.
A. Minerals Management Service
B. Department of Energy
C. Corps of Engineers
D. A recognized classification society approved
KEY: D
[5537]A neutral equilibrium position for a vessel means that the metacenter is ______.
A. lower than the keel
B. at the same height as the center of gravity
C. exactly at midships
D. at the center of the waterplane area
KEY: B
[5538]A partially full tank causes a virtual rise in the height of the ______.
A. metacenter
B. center of buoyancy
C. center of flotation
D. center of gravity
KEY: D
[5539]A ship is inclined at an angle of loll. In the absence of external forces，the righting arm (GZ) is ______.
A. positive
B. negative
C. zero
D. vertical
KEY: C
[5540]A ship lists and trims about the ______.
A. center of gravity
B. center of buoyancy
C. center of flotation
D. centroid of the underwater volume
KEY: C
[5541]A ship with the TCG off the longitudinal centerline inclines to an angle of ______.
A. list
B. heel
C. trim
D. loll
KEY: A
[5542]A slow and easy motion of a vessel in a seaway is an indication of a ______.
A. small GM
B. low center of gravity
C. stiff vessel
D. large GZ
KEY: A
[5543]A stabilogauge is a calculator used to ______. ①Measure GM．②Measure initial stability．
A. ①only
B. ②only
C. Both ①and ②
D. Neither ①nor ②
KEY: C
[5544]A vessel trimmed by the stern has a ______.
A. list
B. drag
C. set
D. sheer
KEY: B
[5545]A vessel with a large GM will ______.
A. have a small amplitude of roll in heavy weather
B. tend to ship water on deck in heavy weather
C. be subject to severe racking stresses
D. be less likely to have cargo shift
KEY: C
[5546]Buoyancy is a measure of the ship's ______.
A. ability to float
B. deadweight
C. freeboard
D. midships strength
KEY: A
[5547]For a given displacement，the righting arm has its maximum value when ______.
A. KG is minimum
B. angle of inclination is a maximum
C. small-angle stability applies
D. KM is a minimum
KEY: A
[5548]For small angles of inclination，if the KG were equal to the KM，then the vessel would have ______.
A. positive stability
B. negative stability
C. neutral stability
D. maximum stability
KEY: C
[5549]GM cannot be used as an indicator of stability at all angles of inclination because ______.
A. M is not fixed at large angles
B. there is no M at large angles
C. G is not fixed at large angles
D. there is no G at large angles
KEY: A
[5550]GM is a measure of ______. ①The initial stability of a vessel．②The rightingness of the vessel．
A. ①only
B. ②only
C. Both ①and ②
D. Neither ①nor ②
KEY: A
20.9 船舶浮性资料
[5551]All these containers will be loaded ______ deck．
A. in
B. up
C. above
D. on
KEY: D
[5552]Your vessel is damaged，listing to port and on occasion flopping to the same angle to starboard. It has a long，slow，sluggish roll around the angle of list. There is excessive trim by the stern with little freeboard aft. What action should you take？______.
A. Jettison any off-center topside weights to lower GM and correct the list.
B. Pump out any slack after double-bottom tanks to reduce free surface and increase freeboard aft.
C. Pump out the after peak and fill the forepeak to change the trim.
D. Press up any slack double-bottom tanks forward of the tipping center，then fill the forepeak if empty.
KEY: D
[5553]Your vessel is damaged and listing to port. There is a short
rolling period around the angle of list. The portside freeboard is reduced to 1 foot. There is no trim and the weather is calm. You should FIRST ______.
A. press up a slack double bottom tank on the port side
B. fill an empty centerline double bottom tank
C. pump out a slack marine portable tank located on the portside amidships
D. jettison the anchors and anchor cables
KEY: C
[5554]Your vessel is damaged and is listing to port. The rolling period is short. There is sufficient freeboard so that deck edge submersion is not a problem. What corrective action should be taken FIRST in regard to the vessel's stability? ______.
A. Press up any slack double-bottom tanks to eliminate free surface
B. Flood any empty double-bottom tanks to add weight low and down
C. Jettison topside weights to reduce KG and KB
D. Shift any off-center weights from port to starboard
KEY: D
[5555]______ is the vertical distance measured on the vessel's side amidships from the load water line to the upper side of the freeboard deck or a point corresponding to it．
A. Buoyancy
B. Freeboard
C. Draft
D. Displacement
KEY: B
[5556]A common occurrence when a vessel is running into shallow water is that ______.
A. the wake is less pronounced
B. the vessel is more responsive to the rudder
C. squat will cause a decrease in bottom clearance and an increase in draft
D. All of the above
KEY: C
[5557]A current moving across a lock entrance toward the river or toward the dam is called a(n) ______.
A. cutoff
B. outdraft
C. lockwash
D. springpool
KEY: B
[5558]A deep draft VLCC (100，000 DWT+) navigating in a narrow channel or canal ______.
A. draws more water than when underway in deep water
B. draws less water with an increase in speed
C. requires less power for a given speed
D. steers better under full power
KEY: A
[5559]A disk with a horizontal line through its center，equivalent to the summer load line，is called the ______.
A. deadrise mark
B. maximum allowable draft mark
C. plimsoll mark
D. tonnage mark
KEY: C
[5560]A large angle of list can be created by which of the following？______. ①Negative initial stability．②Off center weight．
A. ①only
B. ②only
C. Either ①or ②
D. Neither ①nor ②
KEY: C
[5561]A semisubmersible which will not remain upright and will assume a list either to port or starboard is likely to have ______.
A. a large TCG
B. a negative GM
C. excessive ballast
D. insufficient deck load
KEY: B
[5562]A ship's forward draft is 22'-04 and its after draft is 23'-00. The draft amidships is 23'-04. This indicates a concentration of weight ______.
A. at the bow
B. in the lower holds
C. amidships
D. at the ends
KEY: C
[5563]A tank which carries liquid is dangerous to the stability of a vessel when it is ______.
A. low in the vessel
B. completely empty
C. completely full
D. slack
KEY: D
[5564]A vessel is tender if cargo weight is ______.
A. concentrated high and the double bottoms empty
B. concentrated low and the double bottoms empty
C. evenly distributed vertically with the double bottoms full
D. concentrated and with the double bottoms full
KEY: A
[5565]A vessel may acquire a list if the center of gravity is ______. ①Off the centerline．②Too high in the vessel．
A. ①only
B. ②only
C. Either ①or ②
D. Neither ①nor ②
KEY: A
[5566]A vessel would be referred to as tender when the weight of the cargo is ______.
A. evenly distributed vertically and the double bottoms are full
B. concentrated low and the double bottoms are empty
C. concentrated low and the double bottoms are full
D. concentrated high and the double bottoms are empty
KEY: D
[5567]Aboard a ship，multiplying a load's weight by the distance of the load's center of gravity from the centerline results in the load's ______.
A. LCG
B. transverse moment
C. righting moment
D. inclining moment
KEY: B
[5568]Aboard a vessel，multiplying a load's weight by the distance of the load's center of gravity from the centerline results in the load's ______.
A. TCG
B. transverse moment
C. righting moment
D. transverse free surface moment
KEY: B
[5569]After transferring a weight forward on a vessel，the draft at the center of flotation will ______.
A. change，depending on the location of the LCG
B. increase
C. decrease
D. remain constant
KEY: D
[5570]Allowance for fresh water for all freeboards other than timber 25mm. This wording is likely to appear in ______.
A. INTERNATIONAL LOAD LINE CERTIFICATE
B. PASSENGER SHIP SAFETY CERTIFICATE
C. CARGO SHIP SAFETY CONSTRUCTION CERTIFICATE
D. GENERAL DECLARATION
KEY: A
[5571]Although KG for a ship in lightweight is relatively high，the vessel is stiff because ______.
A. KM is small
B. KM is high
C. BL is small
D. KB is large
KEY: B
[5572]Deballasting a double bottom has what affect on KG?
A. KG is increased.
B. KG is decreased.
C. KG is not affected.
D. KG increases at light drafts and decreases at deep drafts. KEY: A
[5573]For a floating vessel，true mean draft is always the ______.
A. average of the observed drafts
B. draft at the center of flotation
C. draft corresponding to the calculated displacement
D. mean of the calculated drafts
KEY: B
[5574]For an upright vessel，draft is the vertical distance between the keel and the ______.
A. waterline
B. freeboard deck
C. plimsoll mark
D. amidships section
KEY: A
[5575]If the buoyant force on a ship's hull is equal to the displacement tonnage，the ship will ______.
A. require ballast
B. be down by the head
C. sink
D. float
KEY: D
[5576]If the cause of severe list or trim is off-center ballast，counterflooding into empty tanks will ______.
A. increase the righting moment
B. increase the righting arm
C. increase list or trim
D. decrease list or trim
KEY: D
[5577]In practice，it is usual for the ship to be loaded ______ to improve the vessel's movement through the water．
A. a little deeper aft
B. a little deeper forward
C. at the same draught between fore and aft
D. a balance between two sides
KEY: A
[5578]In the absence of external forces，the center of buoyancy of an inclined vessel is vertically aligned directly below the ______.
A. center of gravity
B. amidships station
C. center of flotation
D. geometric center of the waterplane area
KEY: A
[5579]Intact buoyancy is a term used to describe ______.
A. the volume of all intact spaces above the waterline
B. an intact space below the surface of a flooded area
C. an intact space which can be flooded without causing a ship to sink
D. the space at which all the vertical upward forces of buoyancy are considered to be concentrated
KEY: B
[5580]It is apparent that there was not sufficient depth of water ______ and I claim that the estimated arrival draft as radioed to the agent to report to you was a close one．
A. for my vessel crossing safely
B. my vessel is to cross safely
C. for my vessel to cross safely
D. for my vessel's crossing safely
KEY: C
[5581]It'll affect neither the draft ______ the rotation of discharging．
A. or
B. and
C. nor
D. either
KEY: C
[5582]Keeping the draft at or below the load line mark will insure that the vessel has adequate ______.
A. ballast
B. reserve buoyancy
C. displacement
D. rolling periods
KEY: B
[5583]My drafts are 28 feet ______ and 29 feet aft．
A. fore
B. advance
C. before
D. beforehand
KEY: A
[5584]On a semisubmersible ship，reserve buoyancy is increased by the presence of void spaces above the waterline in the ______.
A. submerged hulls
B. quarters
C. columns and upper structure
D. submerged connecting structures
KEY: C
[5585]On a vessel，multiplying a load's weight by the distance of the load's center of gravity above the baseline results in a(n) ______.
A. transverse moment
B. vertical moment
C. righting moment
D. inclining moment
KEY: B
[5586]On the cargo manifest，the gross weight of a box containing cargo is the weight of the ______.
A. cargo
B. box
C. cargo and box
D. rate weight
KEY: C
[5587]Owing to the big draft，the ship is not permitted to go alongside until the time of ______.
A. ebb tide
B. flood tide
C. spring tide
D. slack water
KEY: C
[5588]Reducing the liquid free surfaces in a vessel reduces the ______.
A. roll period
B. metacentric height
C. waterplane area
D. vessel's draft
KEY: A
[5589]Reserve buoyancy is ______.
A. also called GM
B. the void portion of the ship below the waterline which is enclosed and watertight
C. affected by the number of transverse watertight bulkheads
D. the watertight portion of a vessel above the waterline
KEY: D
[5590]Reserve buoyancy is the ______.
A. unoccupied space below the waterline
B. volume of intact space above the waterline
C. excess of the buoyant force over the gravity force
D. difference in the buoyant force in salt and fresh waters
KEY: B
[5591]Shifting weight aft in heavy weather will reduce the tendency to yaw，but may increase the tendency to ______.
A. be pooped
B. pitchpole
C. broach
D. squat
KEY: A
[5592]Some cargoes are ______ in weight but ______ in size．
A. lighter／large
B. light／larger
C. lighter／larger
D. light／large
KEY: C
[5593]The angle to which a floating ship，with a negative initial metacentric height，lies while at rest in still water is the angle of ______.
A. trim
B. yaw
C. heel
D. loll
KEY: D
[5594]The average of the forward and after drafts is the ______.
A. mean draft
B. true mean draft
C. mean of the calculated drafts
D. draft at the center of flotation
KEY: A
[5595]The center of buoyancy is located at the ______.
A. geometric center of the waterplane area
B. intersection of the vertical centerline and line of action of the buoyant force
C. center of gravity of the vessel corrected for free surface effects
D. geometric center of the displaced volume
KEY: D
[5596]The center of flotation of a vessel is ______.
A. the center of volume of the immersed portion of the vessel
B. the center of gravity of the water plane
C. that point at which all the vertical downward forces of weight are considered to be concentrated
D. that point at which all the vertical upward forces of buoyancy are considered to be concentrated
KEY: B
[5597]The center of the underwater volume of a floating vessel is the ______.
A. center of buoyancy
B. center of flotation
C. uncorrected height of the center of gravity of the vessel
D. center of gravity of the vessel corrected for free surface effects KEY: A [5598]The center of volume of the immersed portion of the hull is called the ______.
A. center of buoyancy
B. center of flotation
C. center of gravity
D. tipping center
KEY: A
[5599]The controlling depth of the river is ______.
A. the minimum depth of the river prescribed in the channel maintenance program
B. the edge of a dredged channel
C. the highest level to which the river may rise without flooding
D. the least available water in a channel which limits the draft of boats and tows
KEY: D
[5600]The difference between the initial trim and the trim after loading is known as ______.
A. trim
B. change of trim
C. final trim
D. change of draft
KEY: B
20.10 船舶结构与布置
[5601]When and where ______ your Registry Certificate issued？
A. is
B. are
C. was
D. were
KEY: C
[5602]This certificate was issued {under} the provisions．
A. according to
B. with
C. for
D. below
KEY: A
[5603]The Tonnage Certificate gives the ______ of a ship which is classified into gross tonnage and net tonnage．
A. specifications
B. descriptions
C. dimensions
D. prescriptions
KEY: C
[5604]The document which shows a vessel's nationality，ownership，and tonnage is the ______.
A. Manifest Certificate
B. Bill of Lading Certificate
C. Certificate of Nationality
D. Official Logbook
KEY: C
[5605]Deep-sea liners are __________
A. ferries
B. passenger liners
C. cruise ships
D. ocean going vessels
KEY: d
[5606]Merchant vessels can operate in three basic ways，but __________ is not one of them．
A. liners
B. tramps
C. specialized vessels
D. passenger ships
KEY: p。