焊接接头的薄弱环节是()A.焊缝 B.熔合区和过热粗晶区 C.正火区 D.部分相变区 发布时间:2017-11-23 10:24 │ 来源:www.tikuol.com 题型:单项选择题 问题: 焊接接头的薄弱环节是()A.焊缝B.熔合区和过热粗晶区C.正火区D.部分相变区
题型:单项选择题 —Could you tell me _______ the Sports Center?—The day after tomorrow, I think. [ ]A. when will you visit B. when you will visit C. when would you visit D. when you would visit 查看答案
题型:单项选择题 无阀滤池随着过滤的进行,滤料截留的杂质渐增,滤层中的阻力也随之增大,但因虹吸上升管中的水位自动地慢慢上升,这样使得滤层上面的水压(),使滤池()过滤。A.等速B.变速C.增加D.减少 查看答案