A:(﹣∞,e3)
B:(0,e3)
C:(1,e3)
D:(e3,+∞)
My dog is very __________. It is safe(安全的)to touch (触摸) him if you want to.
设函数y=3ax2-2bx+c(a,b,c都为正整数且a-b+c=0),若当x=0与x=1时,都有y>0,则a+b+c的最小值为( )
公元初年,欧亚大陆同时存在的两大帝国是( )