A.25% B.20% C.15% D.12%
A.15% B.18% C.20% D.25%
A.無質(zhì)量控制要求 B.不得大于鋼材負允許偏差值1/4 C.不得大于鋼材負允許偏差值1/2 D.不得大于鋼材負允許偏差值