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單項(xiàng)選擇題

You can safely step in the bight of a line（）.

A.when it is not under strain
B.if both ends are made fast
C.in an emergency
D.at no time

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單項(xiàng)選擇題

When a pilot is on board to pilot the vessel the Letter（）must be hoisted.

A.G
B.H
C.B
D.N