交流接触器的栅片将电弧分割多若干短弧,栅片又大量吸收电弧的(),所以电弧被熄灭。 发布时间:2017-11-29 08:23 │ 来源:www.tikuol.com 题型:填空题 问题: 交流接触器的栅片将电弧分割多若干短弧,栅片又大量吸收电弧的(),所以电弧被熄灭。
题型:填空题 Everyone has periods in their lives ______ everything seems very hard.A.whenB.whereC.whichD.that 查看答案