多项选择题
A.层间锤击B.合理安排装配焊接顺序C.合理选择焊缝尺寸和形状D.尽可能减少焊缝数量,减小焊缝长度E.合理安排焊缝位置
A.The manB.The woman.C.Jane.D.John.
A.call for help from professionalsB.still try to helpC.stand by and not try to helpD.learn it from a doctor