单项选择题

In the International Code of Signals，the code signal meaning I require immediate assistance is（）.

A.AE
B.CB
C.DX
D.CP

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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

单项选择题

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

A.feel the surface of the line for broken fibers
B.measure the reduction in circumference of the line
C.observe any mildew on the outer surface
D.open the strands and examine the inner fibers