单项选择题
A.2mm B.3mm C.4mm D.5mm
A.2kPa B.3kPa C.4kPa D.5kPa
A.Φ0.5mm B.Φ1mm C.Φ1.5mm D.Φ2mm
A.500mm B.1000mm C.1500mm D.1800mm
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