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
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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