单项选择题
A.1.5mm/m B.2mm/m C.2.5mm/m D.5mm/m
A.0.013 B.0.008 C.19.987 D.19.992
A.0.5m B.1m C.1.5m D.2m
A.5-10mm B.10-15mm C.25-30mm D.40-45mm
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