單項(xiàng)選擇題

Renew the （）(穩(wěn)索), please.

A. gooseneck
B. guy
C. center guy
D. stay

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單項(xiàng)選擇題

The（）(貴重貨) must be kept carefully.

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

單項(xiàng)選擇題

The （）(支索)is important to a derrick.

A. block
B. guy
C. stay

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