单项选择题
A.0.20~0.25mm B.0.08~0.20mm C.0.35~0.45mm
A.0.05mm B.0.5mm C.0.005mm
A.0.15mm B.0.35mm C.0.45mm
A.1/3~2/5 B.1/4 C.1/2~1
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