单项选择题Mariners should ensure correct()of aids to navigation during twilight periods when some lighted aids to navigation are lit while others are not.

A.identification
B.distinction
C.discrimination
D.clearly seeing


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1.单项选择题If the winch should fail while you are hauling in the anchor,what prevents the anchor cable from running out().

A.Chain stopper
B.Devil's claw
C.Hawse ratchet
D.Riding pawl

2.单项选择题If the ship is alongside the wharf,what kind of()is used?

A.pilot ladder
B.rope ladder
C.rod ladder
D.accommodation ladder

3.单项选择题If a ship has sternway,with accommodation block aft,she may settle with the wind().

A.on her beam
B.on her stern
C.on her bow
D.broad on the quarter

4.单项选择题Conventional anchors are least likely to hold in a bottom consisting of().

A.soft clay
B.hard mud
C.very soft mud
D.sand

5.单项选择题All the following is true except that().

A.in many places a counter current flows in opposition to the main current close to the bank
B.current can vary with depth of water and large deep draught ships can experience different current effects at differing parts of the hull tend to turn to the wind
C.as speed is reduced,the increased proportion of the ship's vector which is attributable to current will set the ship close to obstructions
D.when close to the berth in a head current,there is a danger that flow inshore of the ship becomes restricted and the ship is subject to interactive forces

6.单项选择题A ship will always want to settle into a position where().

A.the pivot point and point of influence of wind in are not in alignment
B.the pivot point and point of influence of wind in are in alignment
C.the point of influence of wind moves depending on the profile of the ship presented to the wind
D.the ship steams slowly in rough seas

7.单项选择题A check line is().

A.A safety line attached to a man working over the side
B.Used to measure water depth
C.Used to slow the headway of a barge
D.Used to measure the overhead height of a bridge

8.单项选择题A()is the intersection of the surface of a sphere and a plane passing through the center of the sphere.

A.great circle
B.small circle
C.large circle
D.general circle

9.单项选择题A “Mediterranean moor” should be used when().

A.anchoring in the Mediterranean
B.docking stern to a berth
C.docking bow to a berth
D.anchoring in a strong current

10.单项选择题()is not a step for anchoring preparation.

A.To take off the covers from the hawse pipes and clear the spurling pipes
B.To make sure that the windlass is out of gear and the brakes are on
C.To turn the windlass over slowly
D.To inform the engine room to ensure that deck power and water are off