A:存在某个,使得
B:对任意都成立
C:对任意的,都有成立
D:f(x)=0
—We'll meet at the school gate. Is that clear?
—_________.
There are two birthdays in August. (改为一般疑问句)
____ two birthdays in August?
命题甲:f(x+2)是偶函数;
命题乙:f(x)在区间(﹣∞,2)上是减函数,在区间(2,+∞)上是增函数;
命题丙:f(x+2)﹣f(x)在(﹣∞,+∞)上是增函数.
能使命题甲、乙、丙均为真的所有函数的序号是____.
下列关于文学名著内容的表述,说法有错误的一项是( )