单项选择题
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
A．dM≥0.012Lbp B．dM≥0.02Lbp C．dM≥0.02Lbp+2 D．dM≥0.012Lbp+2
A．dF≥0.02Lbp B．dF≥0.025Lbp C．dF≥0.012Lbp D．dF≥0.02Lbp+2
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