A.允許 B.禁止 C.應(yīng)設(shè)專人監(jiān)控 D.采取措施后可以
A.50mm B.100mm C.150mm D.200mm
A.大型吊車吊裝 B.桅桿滑移法吊裝 C.桅桿扳轉(zhuǎn)法吊裝 D.吊推法吊裝