A.625MPa，625MPa B.630MPa，625MPa C.625MPa，615MPa D.630MPa，630MPa
A.0.5-0.8KN/S B.0.8-1.0KN/S C.0.8-1.0MPa D.0.5-0.8MPa
A.mfcu≥fcu，k＋0.7σfcu，min≥fcu，k-0.7σ； B.mfcu≥fcu，k＋0.8σfcu，min≥fcu，kk-0.8σ； C.mfcu≥fcu，k＋0.85σfcu，min≥fcu，k-0.85σ； D.mfcu≥fcu，k＋0.95σfcu，min≥fcu，k-0.95σ。
A.3 B.2 C.1 D.0.5
A.10% B.5% C.2% D.1%
