当钢材的含碳小于()%时,热影响区的()倾向很小,焊前一般不必预热。 发布时间:2020-08-28 17:26 │ 来源:www.tikuol.com 题型:填空题 问题: 当钢材的含碳小于()%时,热影响区的()倾向很小,焊前一般不必预热。
题型:填空题 Frankly speaking. I'd rather you _____ anything about it for the time being.[ ]A. have done B. haven't done C. don't do D. didn't do 查看答案