单项选择题
The （）(千斤滑车) can run the gooseneck.
A. heavy derrick
B. pulley block
C. topping lift block
D. guy tackle
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相关考题
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单项选择题
The （）(重吊杆) can lift heavy cargo.
A. heavy cargo derrick
B. heavy deck
C. jumbo boom
D. heavy block -
单项选择题
The（）(千斤索) is a wire used to take the weight off.
A. light derrick
B. union purchase
C. topping lift
D. heavy derrick -
单项选择题
The （）(双杆联吊) is that two booms are used with a single hook.
A. derrick
B. union purchase
C. topping lift block
D. crane
