单项选择题
A.1.2h B.1.5h C.1h D.40min
A.1 B.2 C.3 D.4
A.10% B.15% C.20% D.5%
A.1.0 B.1.2 C.1.5 D.2.0
A.1.0mm B.1.2mm C.1.5mm D.2.0mm
A.0.5mm,1/2 B.0.6mm,1/2 C.0.5mm,1/3 D.0.6mm,1/3
A.1mm B.2mm C.1.5mm D.0.5mm
A.12.5B.20C.11.5D.25
A.12.5 B.20 C.11.5 D.25
A.100 B.200 C.150 D.180
A.2 B.3 C.1.5 D.2.5