單項選擇題A flashing red light displayed at a single lock means that the lock（）.

A.is ready to use but vessels must stand clear
B.is ready to use and vessels may approach
C.cannot be made ready immediately and vessels shall stand clear
D.cannot be made ready immediately but vessels may approach


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題Your vessel is approaching a bend. You hear a prolonged blast from around the bend. You should （）.

A.back your engines
B.stop your engines and drift
C.answer with one prolonged blast
D.sound the danger signal