A.銅芯 B.鋁芯 C.鐵芯 D.錫芯
A.15% B.17% C.20% D.25%
A.施工安全技術(shù)措施 B.施工組織設(shè)計(jì) C.施工安全組織設(shè)計(jì) D.專項(xiàng)安全施工組織設(shè)計(jì)