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【单选题】
对于可逆反应A（g）＋2B（g） 2C（g）（正反应为吸热反应）达到平衡时，要使正反应速率降低，且使A的浓度增大，应采取的措施是(     )
A.
增大压强
B.
减少B的浓度
C.
减少A的浓度
D.
升高温度
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