原始创新的优势包括（）
A.产品价格
B.技术开发
C.生产制造
D.市场销售
参考答案：B, C, D
已知定义在R上的奇函数f（x）满足f（2-x）=f（x），且在区间[0，1]上是增函数．若函数g（x）=f（x）-log2x有且仅有两个零点，则f（x）的最大值为______．
Which of the following best describes a Treasury note Pays:（）
A. implicit interest; is non-callable; has a 2- to 10-year maturity.
B. explicit interest; is callable; has a 1- to 15-year maturity.
C. explicit interest; is non-callable; has a 2- to 10-year maturity.
