单项选择题 9.循环动画的【超出范围】模式为【往复】，动画超出范围后，从结束帧跳至开始帧，不断循环。 A、正确 B、错误

单项选择题 What are the limitations of the internal rate of return? A、The internal rate of return may not exist. B、There may be multiple solutions to the calculation equation for the internal rate of return. C、The internal rate of return cannot be used for investment decision analysis of mutually exclusive investment projects. D、All of the above

单项选择题 对于一个链串s，查找第i个元素的算法的时间复杂度为（     ）。 A. O(1) B. O(n) C. O(n^2) D. 以上都不对