键盘输入字符串 统计各个字符出现的次数 c\c++实现 键盘输入 求出两个数的最小公倍数和最大公约数c c++实现 单链表实现学生信息输出平均分最高的学生的学号成绩名字等结构体c c++实现 -The keyboard input string statistics each character in the frequency of c \ c++ realized Keyboard input for a minimum of two Numbers LCD and the

单自由度振动系统，求其频响函数，改变质量，阻尼，刚度对频响函数的影响-Single degree of freedom vibration system, find the frequency response function, changing the impact mass, damping and stiffness of the FRF