單項(xiàng)選擇題

The（）(貴重貨) must be kept carefully.

A.VC
B.PC
C.A+B
D.NC

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單項(xiàng)選擇題

The （）(支索)is important to a derrick.

A. block
B. guy
C. stay

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