A.充分不必要条件
B.必要不充分条件
C.充分必要条件
[单选题]已知命题,则﹁p是﹁q的()。A.充分不必要条件B.必要不充分条件C.充分必要条件
[单选题]A.LRNB.NRLC.RLND.RNL
[单选题]A.LRNB.NRLC.RLND.RNL
[单选题]A.54.88kNB.112.9kNC.94.08kND.74.48kN
[单选题]A.0.017B.0.026C.0.051D.0.076
[单选题]A.τ=P/(πDH)B.τ=P/(2dH)C.τ=P/(πdH)D.
[单选题]A.高阶无穷小B.低阶无穷小C.等价无穷小D.同阶但非等价无穷小
[单选题]A.B.C.(-1,e)D.
[单选题]A.单向应力状态B.二向应力状态C.三向应力状态D.纯剪应力状态