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当H2S浓度在4.3%~46%时,它与空气形成的混合气体遇火就发生剧烈的爆炸。
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更多 “当H2S浓度在4.3%~46%时,它与空气形成的混合气体遇火就发生剧烈的爆炸。” 相关考题
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单选题煤矿井下的有害气体主要是由()、CO2、H2S、NO2、H2、NH3气体组成。A
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单选题酶促反应速度(v)达到最大反应速度(Vmax)的80%时,底物浓度[S]为A
p1Ksubm/sub/pB
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单选题A
pIsub2/sub=Isub3/sub/pB
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pIsub2/sub=2Isub3/sub/pD
pIsub3/sub=4Isub2/sub/p
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单选题下列关于矿井有害气体最高允许浓度说法中,不正确的是()。A
CO最高允许浓度为0.0024%B
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单选题标称值为10kΩ的标准电阻在23℃时的校准值Rs为9.9999315kΩ,合成标准不确定度为52mΩ。在被测量服从正态分布的情况下,当包含概率为95%时,测量结果可表示为( )。A
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pRsubs/sub=9.99993kΩ,Usub95/sub=102mΩ,ksub95/sub=1.96/pD
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填空题设字符串S1= “ABCDEF”,S2= “PQRS”,则运算S=CONCAT(SUB(S1,2,LEN(S2)),SUB(S1,LEN(S2),2))后的串值为()。
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