A.2x-y+2=0 B.2x+y+1=0 C.2x+y-3=0 D.2x-y+3=0 A.2x-y+2=0 B.2x+y+1=0 C.2x+y-3=0 D.2x-y+3=0 分类:公用设备师 题型:选择题 查看答案