单项选择题
A.0.25 B.0.3 C.0.4 D.0.5
A.0.5 B.1 C.1.5 D.2
A.0.3 B.0.4 C.0.5 D.0.6
A.1~3mm B.1~5mm C.3~8mm D.3~10mm
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