A.無粘結(jié)預(yù)應(yīng)力筋束數(shù)B.每束預(yù)應(yīng)力根數(shù)C.預(yù)應(yīng)力類型D.預(yù)應(yīng)力根數(shù)
A.1570N/mm2B.1670N/mm2C.1860N/mm2D.1960N/mm2
A.10~15%B.15~20%C.20~25%D.25~30%