题目: The boy's bad behavior _______ his mother many sleepless nights. [ ]A. cost B. made C. cause D. bring 答案: 答案:A
题型:多项选择题 接地装置焊接应采用搭接焊,其搭接长度应满足( )要求。A.扁钢与扁钢搭接应为扁钢宽度的2倍,不少于三面施焊B.圆钢与圆钢搭接应为圆钢直径的6倍,双面施焊C.扁钢与圆钢搭接应为圆钢直径的6倍,双面施焊D.扁钢与钢管、扁锕与角钢焊接时,紧贴角钢外侧两面,或紧贴钢管3/4钢管表面,上下两侧施焊 查看答案