题目： 熔化极氩弧焊有哪些不足？ 答案： 参考答案：1.氩气及混合气体均比气体的售价高，故焊接成本比气体保护焊的焊接成本高。2.MIG焊对工件、焊丝的焊前清理要求较高，即焊接过程对油、绣等污染比较敏感。
题型：选择题 —We’ve finally found the solution with the help of Hans! It’s really great!—____, you know.A．Two heads are better than oneB．Birds of a feather flock togetherC．The early bird catches the wormD．Great minds think alike 查看答案
