问题
单项选择题
The tackle that raises and lowers the boom is（）.
A.the cargo fall
B.The cargo hoisting wire rope
C.the topping lift
D.the cargo whip
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
The tackle that raises and lowers the boom is（）.
A.the cargo fall
B.The cargo hoisting wire rope
C.the topping lift
D.the cargo whip
参考答案：C
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