A:-2,+∞
B:(—2,3)
C:1,3)
D:R
下列事件中,必然事件是( )
We carefully compared the result of the first experiment with_______ of the second one.
直线x+(1+m)y=2﹣m和直线mx+2y+8=0平行,则m的值为( )
修改病句。