方程x+4y=20的非负整数解有( ) A.4组 B.5组 C.6组 D.无数组 发布时间:2017-04-20 04:04 │ 来源:www.tikuol.com 题型:选择题 问题: 方程x+4y=20的非负整数解有( )A.4组B.5组C.6组D.无数组
题型:选择题 The UN should﹍﹍the establishment of Iraqi government after the war, I think.A.take part inB.play a leading role in C.play a role amongD.play a important part for 查看答案