下列叙述不正确的是( )
①NH3易液化，液氨常用作制冷剂
②与金属反应时，稀HNO3可能被还原为更低价态，则稀HNO3氧化性强于浓HNO3
③铵盐受热易分解，因此贮存铵态氮肥时要密封保存，并放在阴凉通风处
④稀HNO3和活泼金属反应时主要得到氢气
| A．①③ | B．②④ | C．①②③④ | D．都不正确 |
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