题干

对处于化学平衡状态的体系,依据化学平衡与化学反应速率的关系可知下列说法正确的是(   )

A:化学反应速率变化时,化学平衡一定发生移动

B:化学平衡发生移动时,化学反应速率一定变化

C:反应向正反应方向进行时,正反应速率一定增大

D:只有使用催化剂,才会出现化学反应速率变化但化学平衡不移动的情况

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B

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