A spanner is a（）.<br>A:cross connection line between two main fire lines<br>B:special wrench for tightening couplings in a fire hose line<br>C:tackle rigged to support a fire hose<br>D:None of the above

A spanner is a（）.
A:cross connection line between two main fire lines
B:special wrench for tightening couplings in a fire hose line
C:tackle rigged to support a fire hose
D:None of the above

出自：海船船员证

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