A.梁底模應(yīng)起拱,起拱高度為6mm B.梁底模應(yīng)起拱,起拱高度為2mm C.梁底模應(yīng)起拱,起拱高度為15mm D.梁底模不用起拱
A.0.5 B.1 C.2 D.3
A.60° B.90° C.135° D.180°