单项选择题
A.1960N B.2500N C.2800N D.3000N
A.500KPa B.550KPa C.600KPa D.650KPa
A.1.6mm±0.3mm B.1.8mm C.1.8mm±0.3mm D.2.1mm
A.0.4s B.0.5s C.0.6s D.0.8s
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