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【单选题】
关于化学平衡常数K的叙述正确的是 [ ]A.
K越大，表示化学反应速率越大
B.
对可逆反应，温度升高，则K值增大
C.
对可逆反应，K越大；表示反应物的转化率越大
D.
加入催化剂或增大反应物的浓度时，K值就增大
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