A.10%~80% B.20%~80% C.10%~90% D.20%~90%
A.產(chǎn)品代號(hào) B.預(yù)應(yīng)力鋼材直徑 C.預(yù)應(yīng)力鋼材等級(jí) D.預(yù)應(yīng)力鋼材根數(shù)
A.±1% B.±0.5% C.±1.5% D.±2%