A.正值 B.負(fù)值 C.0 D.以上均可能
A.4.5 B.5.06 C.5.7 D.6.3
A.dF≥0.02Lbp B.dF≥0.012Lbp C.dF≥0.02Lbp+2 D.dF≥0.012Lbp+2