单项选择题
A.≤0.067%B.≤0.072%C.≤0.058%
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
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