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沼气是一种能源,它的主要成分是CH4。0.5mol CH4完全燃烧生成CO2和H2O时,放出445KJ热量,则下列热化学方程式正确的是(  )

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±0.20%CH4  ±0.10%CH4  ±0.01%CH4  ±0.05%CH4  
≥1.0%CH4;≥1.0%CH44;<1.0%CH4  ≥1.5%CH4;≥1.5%CH44;<1.0%CH4  ≥1.0%CH4;≥1.5%CH44;<1.0%CH4  ≥1.5%CH4;≥1.0%CH44;<1.0%CH4  
±0.20%CH4  ±0.10%CH4  真值的±10%CH4  真值的±20%CH4  
≥1.0%CH4;≥1.0%CH4;  ≥1.5%CH4;≥1.5%CH4;  ≥1.0%CH4;≥1.5%CH4;  ≥1.5%CH4;≥1.0%CH4;  
“N2”、“N2-CO2”、“N2-CH4”、“CH4”;  “CH4”、“N2-CH4”、“N2-CO2”、“N2”;  “N2-CO2”、“N2”、“N2-CH4”、“CH4”;  “CH4”、“N2-CH4”、“N2”、“N2-CO2”。  
2CH4(g)+4O2(g)=2CO2(g)+4H2O(l) △H=+890 kJ·mol-1   CH4(g)+2O2(g)=CO2(g)+2H2O(l) △H=+890 kJ·mol-1   CH4(g)+2O2(g)=CO2(g)+2H2O(l) △H=-890 kJ·mol-1   CH4(g)+O2(g)=CO2(g)+H2O(l) △H=-890 kJ·mol-1  
±0.1%CH4  ±0.2%CH4  0.1%CH4  0.2%CH4  
0.04%CH4,0.4%CH4  0.1%CH4,0.4%CH4  0.02%CH4,0.4%CH4  0.1%CH4,0.5%CH4  
0.1%CH4,0.1%CH4  0.1%CH4,0.4%CH4  0.01%CH4,0.1%CH4  0.01%CH4,0.01%CH4  
≥0.5%CH4,≥0.5%CH4,<0.5%CH4  ≥1.5%CH4,≥1.5%CH4,<1.5%CH4  ≥1.0%CH4,≥1.0%CH4,<1.0%CH4  
沼气(CH4)  赤铁矿(Fe3O.4)  酒精(C.2H.5OH)  石灰石(CaCO3)  

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