通讯原理，信号频域与时域分析，主要是信号的信号频域特性和信号时域特性。 -Communication theory, signal frequency and time domain analysis, the main signal frequency-domain characteristics of the signal and signal time-domain special Sex.

CRC即循环冗余校验码（Cyclic Redundancy Check[1] ）：是数据通信领域中最常用的一种查错校验码，其特征是信息字段和校验字段的长度可以任意选定。循环冗余检查（CRC）是一种数据传输检错功能，对数据进行多项式计算，并将得到的结果附在帧的后面，接收设备也执行类似的算法，以保证数据传输的正确性和完整性。-CRC is the most commonly used in the field of data communication error check code, which

Spiders, close relatives of oil-covered crabs and crayfish, are the only sentient animals who are really vital to the earth's ecosystem. They usually can be found in webs of fine silk, either having just eaten or about to eat, or just having had sex