单项选择题
A.0.5M B.0.75M C.0.8M D.1.0M
A.0.1mm B.0.01mm C.0.2mm D.0.02mm
A.0.1 B.0.2 C.0.3 D.0.4
A.1M B.1.5M C.2.0M D.2.5M
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