在长

代码说明：

在远距离数据通信中，为确保高效而无差错地传送数据，必须对数据进行校验即差错控制。循环冗余校验CRC(Cyclic Redundancy Check/Code)是对一个传送数据块进行校验，是一种高效的差错控制方法。-in long-distance data communication, in order to ensure efficient without error to transmit data, the data must check that the error control. Cyclic Redundancy Check (Cyclic Redundancy Check/Code) is to block transmission of data over a check out, is a highly efficient error control methods.