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
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