A.1% B.3% C.5% D.7%
A.2~4MPa B.4~6MPa C.6~12MPa D.15MPa
A.混凝土構(gòu)件本身 B.預(yù)應(yīng)力張拉臺(tái)座 C.張拉千斤頂 D.后張法預(yù)應(yīng)力專(zhuān)用固定設(shè)備