相关考题
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单项选择题
The （）(吊杆托架) supports the derrick.
A. derrick boom rest
B. derrick head
C. derrick mast
D. derrick guy -
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 -
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
