After the boat is at the top of the davit heads，the davit arms begin moving up the tracks and are stopped by the（）.<br>A:hoist man<br>B:limit switch<br>C:brake handle<br>D:preventer bar

After the boat is at the top of the davit heads，the davit arms begin moving up the tracks and are stopped by the（）.
A:hoist man
B:limit switch
C:brake handle
D:preventer bar

出自：海船船员证

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