问题：
[单选题]发电厂两台发电机组并列运行时,如果两台发电机的有功出力都没有达到额定值,且有,当发电厂有功负荷减小时,应该首先减小有功出力的是( )。
A、1号机组
B、2号机组
C、同时减小
D、不确定
参考答案：
B
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