单项选择题
A.0.2% B.0.4% C.0.1% D.0.3%
A.0.8mm B.1.0mm C.1.2mm D.1.5mm
A.0.6mm B.0.4mm C.0.5mm D.0.3mm
A.1h B.2h C.3h D.4h
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