单项选择题

A flashing green light displayed at a single lock means that the lock is（）.

A.ready for entrance
B.ready for entrance，but gates cannot be closed completely
C.being made ready for entrance
D.not ready for entrance

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单项选择题

You are on an ice-reinforced vessel about to enter packice. You should（）.

A.enter the pack on the windward side where there is a well defined ice edge
B.trim to an even keel or slightly down by the bow to take maximum benefit of the ice reinforcement
C.take maximum advantage of coastal leads caused by offshore winds
D.look for areas of rotten ice and enter perpendicular to the ice edge

单项选择题

Which will most likely occur when entering shallow water? （）

A.Rudder action will become more effective
B.The vessel's list will change
C.The vessel's trim will change
D.An increase in speed will occur

单项选择题

The principal danger from ice collecting on a vessel is the（）.

A.decrease in capabilities of radar
B.decrease in displacement
C.adverse effect on trim
D.loss of stability