单项选择题

A “check” line is（）.

A.a safety line attached to a man working over the side
B.used to measure water depth
C.used to slow the headway of a barge
D.used to measure the overhead height of a bridge

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A “bowline” is used to（）.

A.join lines of equal size
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“safe speed” is defined as that speed where（）.

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