一个RFC3261的中文版本，关于SIP协议的，说明很详细，英文不好的省好多事呢...

linux-c语言开发时用到的函数集合.可以有助快迅速开发程序所要的函数-linux-c

oracle 内部函数，方便学习，函数字典-oracle internal function to facilitate learning, function dictionary

本文结合555Datasheet，图文并茂地的介绍了如何阅读集成电路的Datasheet-555Datasheet this paper, the illustrations of how to read IC Datasheet

连续信号的采样定理的验证，对采样定理的理解有一定指导作用-Sampling theorem for signals in the authentication, the understanding of the sampling theorem have a certain role in guiding

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采样率小于一个连续时间信号最大频率的2倍时就叫undersampling，欠采样，根据抽样定理，当fs>=2fmax，也就是oversampling，过采样时，数字信号才能重建成原来的模拟信号，欠采样重建会发生混叠-Sampling rate of a continuous-time signal is less than the maximum frequency of 2 times is called undersampling, bandpass sampling, according to sampling theorem, when fs

连连看在线玩，测试过，可以用的，非常简单，直接下下为就可以了-Lianliankan online play, test, and can be very simple, direct for the next can be a

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编写一个程序，在屏幕上出现一个圆心沿正弦曲线轨迹移动的实心圆，要求每隔4分之一周期，圆的填充色和圆的周边颜色都发生变化（颜色自己选取），同时圆的半径在四分之一周期内由正弦曲线幅值的0.2倍至0.6倍的线性增长。-The preparation of a procedure on the screen there is a center of a circle along the sinusoid trajectory mobile solid round, one request every 4 cycles, a circle filled with color and circle around the color change (color select their own), while the radius of a circle in the quarter-cycle sinusoid amplitude by 0.2 times to 0.6 times the linear growth.

大学物理第3册答案里面有详细的解题步骤包括选择题-University Physics Article 3 which have a detailed answer to problem-solving steps include multiple-choice questions