單項(xiàng)選擇題

The （）(支索)is important to a derrick.

A. block
B. guy
C. stay

你可能感興趣的試題

單項(xiàng)選擇題

The （）(吊桿托架) supports the derrick.

A. derrick boom rest
B. derrick head
C. derrick mast
D. derrick guy

單項(xiàng)選擇題

The （）(千斤滑車) can run the gooseneck.

A. heavy derrick
B. pulley block
C. topping lift block
D. guy tackle