A check line is（）.<br>A:A safety line attached to a man working over the side<br>B:Used to measure water depth<br>C:Used to slow the headway of a barge<br>D:Used to measure the overhead height of a bridge

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

出自：海船船员证

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