Three Phase

说明：  机械设计课程设计二级齿轮减速器设计计算程序(Design and calculation program of two-stage gear reducer)

当你输入要输出的阶数时，会相应的得到从1开始输出的顺时针的数(When you enter the order number to be output, it will be a corresponding output starts from a number of clockwise)

pwm整流器双闭环解耦控制，输出电压220v(Double closed loop control of PWM rectifier)

winsock文件传输，界面很漂亮哦，能够在客户端和服务器之间传输文件。-winsock file transfer, the interface is beautiful Oh, to the client and server to transfer files between.

重启mycat服务，关闭 或 重启...............(reload mycat service)

说明：  三相电弧炉，用于研究间谐波的传播以及谐振等问题。(The arc furnace which is used to analyze the harmonic and some other questions.)

作为一款大型高并发高负载的开源SNS(社交网络服务)软件，iwebSNS功能强大，易于扩展，具有良好的伸缩性和稳定性-As a large, high-concurrency high-load open source SNS (social network service) software, iwebSNS powerful, easy to expand, has good scalability and stability of the

说明：  VMD程序，适用于振动信号，不适用于宽频信号(Realize standard FFT transform. FFT is used to get the spectrum of the signal, which is not suitable for wideband signal)

n=eval(input()) def x(n): if n<=3 and n>=0: return n else: return x(n-1)+x(n-2)+x(n-3) print(x(n))

说明：  美国无损检测手册 超声卷（上册） 美国无损检测手册 超声卷（下册） 超声手册之超声换能器 无损检测II级培训教材 超声波检测(American nondestructive testing manual ultrasonic volume (Volume 1) American nondestructive testing manual ultrasonic volume (Volume 2) ultrasonic manual ultrasonic testing for ultrasonic transducers level II training material ultrasonic testing)