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说明：  下面的程序利用友元函数求两点间的距离。请你将有关的程序补充完整，并总结为什么这里要用友元函数来求两点间的距离。(using friend to get the result.)

六路炉温检测系统，含有技术报告，原理图、pcb，系统源程序，上位机源程序。(Her temperature detection system, contain a technical report, schematic and PCB, system source code, source program of the host computer is designed.)

利用数字温度传感器DS18B20与单片机结合来测量温度控制器，使用单片机AT89C51,测温传感器使用DS18B20，用3位共阳极LED数码管以串口传送数据，实现温度显示。(Binding to measure the temperature controller, using the AT89C51 microcontroller, DS18B20 temperature sensors, with a common anode three LED digital serial transmission of data to achieve using a digital temperature display and temperature sensor DS18B20 microcontroller.)

CARRIER todo esto es un documento elaborado con la mayora facilidad

光伏逆变器SVPWM设计原理图,包含逆变器控制算法(PV inverter SVPWM design schematics, including inverter control algorithm)

经典赛车游戏的基础模型，基于LPC2138芯片设计，可在ILI9320 LCD触摸屏上操作(The basis of classic car racing game model, based on the LPC2138 chip design, can be in ILI9320 LCD touch screen operation)

proteus仿真，以LPC2138芯片为核心生成PWM波，控制升压斩波电路（PWM），实现稳定的高电压输出。包含AD转换、串口通信。(proteus simulation. This design use PWM wave generated by LPC2138 to control boost circuit and realized a steady high voltage output. ADC and serial port communication are involved in the design.)

基于单片机农作物智能灌溉控制技术 简单易懂程序(Microcontroller-based smart irrigation control technology crops straightforward program)

串行da模块的应用，和单片机通信，通过单片机控制da模块(Serial da module application, and single-chip communication, via da MCU control module)

51单片机模拟一个USB键盘的代码，c语言编写的(51 USB keyboard microcontroller code that simulates a, c languages)