相关考题
-
单项选择题
The （）(支索)is important to a derrick.
A. block
B. guy
C. stay -
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
