单项选择题

Chart/Publication correction record Card system ensures that every chart is properly corrected（）.

A.in use
B.prior to use
C.after use
D.When chart received on board

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What is the distance from the bottom of a wave trough to the top of a wave crest?（）

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Depths in the routes (Malacca and Singapore Straits) vary between 20m and about 23m but there are many areas of sand waves and depths are liable to change. The statement infers that（）.

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The lifeboat is constructed of（）

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B.glass-reinforced plastic
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D.powered