单项选择题
A.10-20KPaB.15-30KPaC.20-40KPa
A.1/10~1/8B.1/9~1/7C.1/8~1/7
A.75-85B.80-90C.85-95
A.3~5.5KPaB.1~3.5KPaC.2.2~4.5KPa
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