活塞式外部润滑油粘度的选择,主要是考虑维持轴承液体润滑的形成,一般可应用粘度级为() 发布时间:2017-08-04 05:12 │ 来源:www.tikuol.com 题型:单项选择题 问题: 活塞式外部润滑油粘度的选择,主要是考虑维持轴承液体润滑的形成,一般可应用粘度级为()mm2/s(50℃)的抗磨液压油A.20~30B.30~40C.40~50D.50~60
题型:单项选择题 —How about the movie you saw yesterday? —Some people think it's boring, think it's exciting, [ ]A. others B. other C. each D. another 查看答案