当发电机内充有氢气或主轴旋转时,密封油压必须维持;正常工况时,额定氢压为()时油压高 发布时间:2017-05-11 22:56 │ 来源:www.tikuol.com 题型:填空题 问题: 当发电机内充有氢气或主轴旋转时,密封油压必须维持;正常工况时,额定氢压为()时油压高于氢压
题型:填空题 —What are these? —______. [ ]A. They are buses B. These are bus C. Yes, they are buses D. Yes, these are buses 查看答案