A:有丝分裂
B:分化
C:减数分裂
D:全能性
When I passed this afternoon, I saw a little boy was lying on the grass, his hands _____ under his head.
____do you usually____on weekends?
若函数f(x)=(x2﹣cx+5)ex在区间12,4上单调递增,则实数c的取值范围是( )