单选题
1分
When removing a centrifugal pump for inspection and maintenance, __________ and _______ pump electri...
When removing a centrifugal pump for inspection and maintenance, __________ and _______ pump electrical circuit breaker on main switch board.
参考答案: D
参考解析: 当拆除离心泵进行检查和保养时,切断主配电板上泵的断路器并贴告示牌。