题型:问答题 简答题 Syria's foreign ministry yesterday accused Israel ______ working with "terrorist groups" after it carried out two strikes against Syrian targets.A.ofB.withC.onD.against 查看答案
题型:问答题 简答题 当使用换元法解方程(xx+1)2-2(xx+1)-3=0时,若设y=xx+1,则原方程可变形为( )A.y2+2y+3=0B.y2-2y+3=0C.y2+2y-3=0D.y2-2y-3=0 查看答案