单项选择题

In order to pay out or slack a mooring line which is under strain，you should（）.

A.sluice the line
B.surge the line
C.stopper the line
D.slip the line

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In order to maintain a safe speed at all times，any necessary alterations of speed must（）.

A.be instantly put on
B.be instant put into use
C.be instantly put into effect
D.be put immediately

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In order to detect rot in manila lines，you should（）.

A.feel the surface of the line for broken fibers
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C.observe any mildew on the outer surface
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In heavy seas the helmsman should steer the survival craft（）.

A.into the seas
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C.in the same direction as the seas
D.in a series of figure-eights