煤气中的有毒成份为()和H2S。A、CO2B、CH4C、CO

煤气中的有毒成份为()和H2S。

  • A、CO2
  • B、CH4
  • C、CO

相关考题:

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煤气中的有毒成份为CO和H2S。此题为判断题(对,错)。

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煤气中的有毒成份为CO和H2S。()

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()。

s=”this is the mainstring”,sub=”string”,strindex(s,sub)是()

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多选题标准砝码的质量为m,测量得到的最佳估计值为100.02147g,合成标准不确定uc(ms) 为0.35mg,取包含因子k=2,以下表示的测量结果中 ( ) 是正确的。Apmsubs/sub=100.02147g;U=0.70mg,k=2/pBpmsubs/sub=(100.02147±0.00070)g;k=2/pCpmsubs/sub=100.02147g;usubc/sub(msubs/sub)=0.35mg,k=1/pDpmsubs/sub=100.02147g;usubc/sub(msubs/sub)=0.35mg/p

填空题s=”this is the mainstring”,sub=”string”,strindex(s,sub)是()

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