单项选择题
A.1.887 5 B.1.282 6 C.1.05 D.2.005 6
A.0.042 7 B.0.035 6 C.0.032 8 D.0.029 6
A.7.1 mm,9.0 mm B.7.1 mm,8.7 mm C.7.5 mm,9.0 mm D.7.5 mm,8.7 mm