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【单选题】
工业上进行的化学反应,原料中反应物摩尔量之比一般不符合化学计量关系,所以在反应系统的分析计算中多选用关键组分。根据实际需要,关键组分是指:
A.
不过量的反应物
B.
目的产物
C.
各反应物中价值最高的组分
D.
价值最高的反应产物
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