A:(12,+∞)
B:1,+∞)
C:(12,1
D:(﹣∞,1
We're proud that China _________ stronger and stronger these years.
一 Who is that? — .
设 m→ , n→ 为非零向量,则“存在负数λ,使得 m→ =λ n→ ”是 m→ • n→ <0”的( )