采用端面焊可提高接头的密封性能,一般是()。A、先胀后焊 B、先焊后胀 C、胀、焊同 发布时间:2019-08-31 20:40 │ 来源:www.tikuol.com 题型:单项选择题 问题: 采用端面焊可提高接头的密封性能,一般是()。A、先胀后焊B、先焊后胀C、胀、焊同时D、任意
题型:单项选择题 — You seem unhappy today, Jane. ______— I lost my new bike yesterday.[ ]A. How's that? B. What's on? C. What a pity! D. Did you sleep well last night? 查看答案