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搜题
【单选题】
氮气制备的方法是（）A.
将硝酸铵NH4NO3加热
B.
将亚硝酸胺 NH4NO2 加热
C.
将氯气和氨气混合
D.
B 和 C
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【简答题】Passage 2 Directions: Listen to a short passage three times. When the passage is read for the first time, listen for its general idea. When the passage is read for the second time, fill in the blanks ...
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