下列命题:①若区间D内存在实数x使得f(x+1)>f(x),则y=f(x)在D上是增函数; ② 在定义域内是增函数;③函数 图象关于原点对称;④既是奇函数又是偶函数的函数一定是 ='0' ; ⑤函数 y = f ( x +2)图象与函数 y = f (2- x )图象关于直线 x =2对称;其中正确命题的个数为:( )
【简答题】Passage 2 1. what’s true about the Intel Science Talent Search competition? A. The competition was called the Westinghouse Science Talent Search until . B. It is set up for college students. C. Co...