单项选择题
A.9m*9m B.10m*10m C.11m*11m D.12m*12m
A.50 B.60 C.70 D.80
A.10 B.20 C.30 D.40
A.0.01B.0.03C.0.05D.0.1
A.20 B.30 C.45 D.60
A.20N B.35N C.49N D.54N
A.75% B.80% C.85% D.90%
A.0 B.5 C.8 D.10
A.Φ12 B.Φ16 C.Φ18 D.Φ30
A.5% B.10% C.15% D.20%
A.300转/分 B.200转/分 C.120转/分 D.50转/分