要求焊缝有良好的塑性、韧性和抗裂性能时,应选用()焊条。A、酸性 B、铁粉高效 C、 发布时间:2019-08-19 11:58 │ 来源:www.tikuol.com 题型:单项选择题 问题: 要求焊缝有良好的塑性、韧性和抗裂性能时,应选用()焊条。A、酸性B、铁粉高效C、碱性D、低温
题型:单项选择题 —Is that your teacher?—That_____be Mr.Wang. He has gone to Japan with his wife.[ ]A. can'tB. mustn'tC. may not 查看答案