电动机在运行中发生哪些情况时，应立即停机，然后启动备用设备？

A. 各转动部位有无异响

B. 各部温度应无异常

C. 各仪表指示

D. 各风门状态正常

A. 电动机所拖动的机械发生故障或卡死、电动机强烈振动、发生人身事故

B. 电动机在发热和发出异常声音；电动机的启动装置、电动机冒烟起火

C. 电动机轴承温度超过允许值

D. 电动机缺相运行

A、励磁回路接地，转子绕组短路，发电机冒烟时

B、发现并列运行的发电机，因失掉励磁或其他故障而失去同步时

C、轻载运转时，电刷发生强烈火花

D、活塞在汽缸内卡住

A．Each person has a rightful and protected place in the social order

B．The actions of authorities should not be challenged or questioned

C．Hierarchy and inequality are appropriate and beneficial

D．Those with social status have a right to use their power for whatever purposes and in whatever ways they deem desirable