单项选择题
A.2 B.3 C.5 D.10
A.0.1~0.2mm B.0.1~0.3mm C.0.2~0.3mm D.0.2~0.4mm
A.0–50 B.40-100 C.20-100 D.4-20
A.0–5 B.4-20 C.0-10 D.3-15
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