单项选择题
A.2m B.3m C.4m D.5m
A.25mm³4mm～40mm³4mm B.20mm³4mm～40mm³4mm C.15mm³4mm～40mm³4mm D.10mm³4mm～40mm³4mm
A.2～4mm B.5～7mm C.8～10mm D.12～14mm
A.20 B.50 C.100 D.150
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