单项选择题
A.15.82 B.17.33 C.19.5 D.18
A.1.58 B.6.34 C.13.33 D.15
A.0.47mm2,4.86mm2 B.0.81mm2,4.86mm2 C.0.47mm2,9.72mm2 D.0.81mm2,9.72mm2