一个不大成熟的学籍管理系统，有界面，有注释，但还不大成熟，希望高手指点一下。...

锁相环PLL原理与应用入门教程，很经典，值得一看(Principle and Application of phase-locked loop PLL Tutorial, very classic, worth a visit)

pic16f690 两线控制1602,PIC16F690 单片机编写，自己弄了逆变器上用的，绝对能用

上海交通大学数据结构课程的课后作业系列3.5：仅供参考，最好还是自己去写(Shanghai Jiaotong University data structure course homework Series 3.5: for reference, it is best to write their own)

simple法计算流体的计算案例，有代码和解释过程

说明：  超声波传感器数据采集，arduino实现。并在道路检测中使用(The data acquisition of ultrasonic sensor is realized by Arduino. And it is used in road detection)

远程聊天写，VS.NET 写的远程聊天室程序 -Remote Chat write, write VS.NET remote procedure Chat Room

网络会议讨论，利用组播技术进行网络会议讨论-Network meetings to discuss the use of multicast technology, the network session to discuss

手工计算的三维圆台 放弃一切3dmax,mayer... 的帮助. 朋友们,试试返璞归真的感觉把(manual calculation of 3D Yuan Taiwan to abandon all 3Dmax, mayer ... help. Friends, the feeling is just try to put)

aswindows programs code i am is a

说明：  今天，小 G 已了解到修理厂共有 m 种不同的修理原料，对于第 i 种原料，可以对任意一个石桥的美化度增加 di，当然这也需要花费 hi 的费用。由于发货场的修理原料有限，对于任意一种修理原料，只有一件，也就是说小 G 只能选择购买和不购买，对于第 i 种修理材料能成功修理第 j 个石桥的条件是：当且仅当 hi ≥ pj，di ≥ vj。现在，已知这 n 个石桥修理的最小花费值，最小美化需求度，以及 m 种修理原料的费用，可对石桥增加的美化度值，请你帮助小 G 完成这个修理任务。(Today, Xiao G has learned that there are m different repair materials in the repair shop. For the first material, Di can be added to the beautification of any stone bridge. Of course, it also costs hi. Because of the limited repair materials in the delivery yard, there is only one repair material for any kind of repair material, that is to say, small G can only choose to buy or not to buy. For the first repair material, the condition for successful repair of the jth stone bridge is: if and only if hi is greater than pj, Di is greater than vj. Now, the minimum cost of repairing n stone bridges, the minimum demand for beautification, and the cost of m kinds of repairing materials are known, which can increase the beautification value of stone bridges. Please help Xiao G to complete this repairing task.)