单项选择题
A.20kPaB.30kPaC.40kPaD.50kPa
A.0.1~0.2MPaB.0.2~0.3MPaC.0.3~0.4MPaD.0.4~0.5MPa
A.0.2~0.4MPaB.0.4~0.6MPaC.0.6~0.8MPaD.0.8~1MPa
A.0.4MPaB.0.6MPaC.0.8MPaD.1MPa
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