https://blog.csdn.net/weixin_38184741/article/details/100123002
https://blog.csdn.net/a935367276/article/details/92853665
//总线参考示例
https://blog.csdn.net/qinrenzhi/article/details/79558542
//其他问题
https://blog.csdn.net/heshaofu/article/details/42677523