单项选择题
A.2.0 B.1.5 C.2.5 D.4.0
A.1/100 B.1/500 C.1/1000 D.1/2000
A.0.5mm B.1.5mm C.2.0mm D.3.0mm
A.0.5 B.0.4 C.0.3 D.0.2
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