A:45x
B:90x2
C:120x3
D:252x4
I wanted to go to the museum last Sunday.(变为一般疑问句)
____ ____want to go to the museum last Sunday?
设α,β分别为两个不同的平面,直线l⊂α,则“l⊥β”是“α⊥β”成立的( )