题目:
焊接接头是指由二个或二个以上零件要用焊接组合或已经焊合的接点。检验接头性能应考虑焊缝、熔合区、热影响区甚至母材等不同部位的相互影响。
答案:
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参考答案:Dear Tom, I have received your letter saying that you plan to visit China for a week next month.Your letter gives me much pleasure and let me be a good h...