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【单选题】
某金属的单质跟一定浓度的硝酸反应，假定只产生单一的还原产物，当参加反应的单质与被还原的硝酸的物质的量之比为2：1时，还原产物是（）。A.
NO 2
B.
NO
C.
N 2 O
D.
N 2
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