问题
单项选择题
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
答案
参考答案:B
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
参考答案:B