单项选择题
A.0.3~0.5mm B.0.4~0.6mm C.0.5~0.7mm D.0.6~0.8mm
A.60% B.70% C.80% D.90%
A.0.5-1.5 B.0.5-2.5 C.0.5-2 D.0.5-3