当辅机保护插件动作后,若接触器打不开,约经()s二次保护继电器动作,使主断路器跳闸。 发布时间:2017-06-25 17:15 │ 来源:www.tikuol.com 题型:单项选择题 问题: 当辅机保护插件动作后,若接触器打不开,约经()s二次保护继电器动作,使主断路器跳闸。A、4B、5C、6D、8
题型:单项选择题 Ever since that political congress last year took many effective measures to develop economy, great changes of peo ple’s life have .A.came to power; taken placeB.came to power; been taken placeC.coming to power; been taken placeD.coming to power; taken place 查看答案