单项选择题
A.≤4Ω B.≤100Ω C.≤50Ω D.≤10Ω
A.一级120〈V〈180 B.二级单罐容积小于50m3 C.三级单罐容积小于30m3 D.三级V≤60m3
A.0.1Mpa，0.25MPa B.0.15Mpa，0.2MPa C.0.2Mpa，0.25MPa D.0.15Mpa，0.25Mpa
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