单项选择题
A.0.5mm B.0.7mm C.1.0mm D.1.2mm
A.0.2~1.0mm B.0.3~1.3mm C.0.5~1.5mm D.0.5~2.0mm
A.1.1~1.8倍 B.1.1~1.6倍 C.1.1~1.5倍 D.1.1~1.3倍