单项选择题
A. awkward cargo B. drummed cargo C. cased cargo D. heavy cargo
Renew the （）(稳索), please.A. gooseneckB. guyC. center gu...
单项选择题Renew the （）(稳索), please.
A. gooseneck B. guy C. center guy D. stay
The（）(贵重货) must be kept carefully.A.VCB.PCC.A+BD.NC
单项选择题The（）(贵重货) must be kept carefully.
A.VC B.PC C.A+B D.NC
The （）(支索)is important to a derrick.A. blockB. guyC. st...
单项选择题The （）(支索)is important to a derrick.
A. block B. guy C. stay
