选择重传ARQ协议。自行编写，可以运行，注释详细，结构清晰，易于改写。使用队列实现选择选择重传ARQ，设定了传输时延和最大重传次数。-Select the retransmission ARQ protocol.Written by oneself, can run, annotation in detail, the structure is clear, easy to rewrite.Using queue implementation choices to choose the retransmission ARQ, setting the maximum retransmission times and transmission delay.