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【单选题】
N 2 ( g ) , O 2 ( g ) 系统中加入一种固体催化剂,可生成多种气态氮氧化物,则系统的组分数 C 为 ( )。
A.
C=1 ；
B.
C=2 ；
C.
C=3 ；
D.
C=4 。
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