The tackle that raises and lowers the boom is（）.<br>A:the cargo fall<br>B:The cargo hoisting wire rope<br>C:the topping lift<br>D:the cargo whip

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

出自：海船船员证

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