【单选题】
阀门维护前应确认阀门已退出运行,悬挂禁止操作牌,带执行机构的阀门应将阀门_______
A. 切换至就地STOP状态并切断动力电源
B. 上锁
C. 切换至远控状态并切断动力电源
D. 切换至就地STOP状态
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发电机检修前,依次关闭的顺序为____;___
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