问题
判断题
过电流继电器的线圈串在相应电动机的定子回路中,而其常闭触点却串在控制回路中,因此能保证主接触持续闭合,使电动机获得电继续运转。
答案
参考答案:对
过电流继电器的线圈串在相应电动机的定子回路中,而其常闭触点却串在控制回路中,因此能保证主接触持续闭合,使电动机获得电继续运转。
参考答案:对
完形填空。 | ||||
Most children like 1 _TV. It's very interesting By _ 2 _TV they can __3 _ a lot , learn a lot and know many __ 4 _about their country and the world. Of course they canalso leam 5 the radio (无线电) . But they can learn better and more easily 6 ___ TV , because they can hear and watch at the same time, but they can't see __7 _over the radio. TV helps __ 8 children's eyes. TV helps to open their minds (智力) too. They learn newer and better ways of ___9 things. Many children watch TV 10 _weekends. But some students watch TV every night. They usually go to bed very late. They can't have a good rest. | ||||
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