Amfcu≥fcu,k+0.7σfcu,min≥fcu,k-0.7σ;
Bmfcu≥fcu,k+0.8σfcu,min≥fcu,kk-0.8σ;
Cmfcu≥fcu,k+0.85σfcu,min≥fcu,k-0.85σ;
Dmfcu≥fcu,k+0.95σfcu,min≥fcu,k-0.95σ。
分享
语音搜题
拍照搜题
打赏