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[单选题]
我国国家标准规定民用天然气中硫化氢含量最高允许浓度是()。
A.20mg/m3
B.15mg/m3
C.5mg/m3
D.50mg/m3
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A.20mg/m3
B.15mg/m3
C.5mg/m3
D.50mg/m3
天然气的质量指标中规定,硫化氢含量不能超过:()。
A.50mg/m3
B.40mg/m3
C.30mg/m3
D.20mg/m3
A.30mg/m3(20ppm)
B.45mg/m3(30ppm)
C.75mg/m3(50ppm)
D.150mg/m3(100ppm)