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下列关于CH4的说法中,正确的是(  )

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CH4、NH3、H2O、HF   HF、H2O、NH3、CH4   H2O、HF、CH4、NH3   HF、H2O、CH4、NH3、  
±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”。  
2.00%~3.00%CH4  3.00%~5.00%CH4  1.00%~2.00%CH4  2.00%~4.00%CH4  
±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  
报警浓度≥1.0%CH4  断电浓度≥1.0%CH4  断电浓度≥1.5%CH4  复电浓度<1.0%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  
负极反应式为:CH4+10OH--8e=CO32-+7H2O  负极反应式为:O2+2H2O+4e=4OH-  随着放电的进行,溶液的pH不变  放电时溶液中的阴离子向正极移动  
≥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  
该反应的焓变△H>0  图中Z的大小为a>3>b  图中X点对应的平衡混合物中  温度不变时,图中X点对应的平衡在加压后φ(CH4)减小  
都是σ键,没有π键   都是π键,没有σ键   既有π键,又有σ键  除CH4外,都是σ键  

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