()焊接,为确保底层焊接表面成型光滑平整,均采用手工虚弧打底、手工电弧焊成型。A.碳 发布时间:2022-09-05 13:46 │ 来源:www.tikuol.com 题型:多项选择题 问题: ()焊接,为确保底层焊接表面成型光滑平整,均采用手工虚弧打底、手工电弧焊成型。A.碳毒钢管B.合金钢管C.不锈钢管D.钛管
题型:多项选择题 Rather than _______in the city, the old man would prefer______in the countryside.A.stay; livingB.to stay; to liveC.stay ;to liveD.to stay ; living[ 查看答案