单项选择题
A.5 B.10 C.15 D.20
A.5 B.6 C.7 D.8
A.5B.6C.7D.8
A.0.3B.0.5C.0.6D.0.9
A.2‰ B.3‰ C.4‰ D.5‰
A.2 B.2.5 C.3 D.4
A.20 B.25 C.30 D.40
A.0.3 B.0.5 C.0.6 D.0.9
A.20 B.25 C.32 D.40
A.100~110 B.110~120 C.110~130 D.120~130
A.顶平偏心 B.底平偏心 C.管中对齐 D.无所谓
