单项选择题

The boom stops on a pedestal crane prevent the boom from（）.

A.being raised too high
B.swinging at sea
C.overloading when not in use
D.being lowered too low

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单项选择题

The average height of the surface of the sea for all stages of the tide over a 19 year period is called（）.

A.mean high water
B.mean low water
C.half-tide level
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The 3-cm radar as compared to a 10-cm radar with similar specifications will（）.

A.give better range performance in rain，hail，etc
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C.have less sea return in choppy rough seas
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The “urgent” priority should be used for messages（）.

A.concerning the Safety of Life at Sea (SOLAS)
B.detailing important navigational warnings
C.containing information concerning the safety of a mobile unit or person
D.concerning on-scene communications