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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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

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

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

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

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