A.1 B.2 C.3 D.4
A.先吊鋼筋上錨的梁,其次吊鋼筋直錨的梁,最后吊鋼筋下錨的梁 B.先吊鋼筋下錨的梁,其次吊鋼筋直錨的梁,最后吊鋼筋上錨的梁 C.先吊鋼筋上錨的梁,其次吊鋼筋下錨的梁,最后吊鋼筋直錨的梁 D.先吊鋼筋下錨的梁,其次吊鋼筋上錨的梁,最后吊鋼筋直錨的梁
A.梁低的先吊,梁高的后吊 B.梁高的先吊,梁低的后吊 C.同時起吊