Python string

my program c++ learning process three

蜂鸣器音乐演奏，有ppt说明，及实例工程文件。(Music buzzer, a ppt notes, and examples of engineering documents.)

说明：  满级后自动更换武功，会卡武功，对于经验高的服务器，几个小时就能练满(After full-level automatic replacement of martial arts, will card martial arts, for highly experienced servers, a few hours can be fully trained)

经典的视觉显著性检测的论文，在网站可以找到对应的源码。很有参考价值(The classic visual detection of significant papers on the website can be found in the corresponding source code. Of great reference value)

阐述开关电源充电器原理，输入电压220V，输出电压48V，单管式开关电源，基于UC3842和LM358，带短路保护(Describes the principle of switching power charger, input voltage 220V, output voltage 48V, single tube switching power supply, based on UC3842 and LM358, with short circuit protection)

本人设计的三相有源逆变器，可以完美运行，希望对想学习的人有所帮助(The three-phase active inverter designed by myself can run perfectly.)

remote retail billing system

说明：  字节与位的转换，将一个字节转换为8位输出(Byte to Bit Conversion)

Flash产品展示-弹跳动画版本，来自国外的flash 产品图片展示，鼠标放上去，图片会弹跳几下，然后停止，好像很人性化，响应你的鼠标，每个图片都有一个文字说明，且当前图片的下边会显示一个小三角，基于Flash8源文件，效果如截图所示。

pip -19.1 zip can use