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。-Cyclic Redundancy Check (CRC) is a data transmission error detection function, the data polynomial, and the result was attached to the back frame, the receiving device also