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(1)按下列要求选择序号填空。 A. CH4 B. .2Fe3+ C. .CO32- D.3O3 E.OH- F. .C2H5OH G. .3O2 H. 2Fe2+ ...

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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”。  
±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  

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