A:m>1
B:m<1
C:m≤1
D:m≥1
There was a gym in my school twenty years ago. (判断正误)
下面句子运用修辞手法有误的是( )
①ED⊥平面ACD ②CD⊥平面BED ③BD⊥平面ACD ④AD⊥平面BED.