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1 In case of failure on the highway during the day or at night, the warning sign shall be set at 50 ~ 100 meters behind the vehicle.前朱鸟（雀）而后玄武，左青龙而右白虎，招摇在上。8, do not understand weakness set up a strong enemyIn other words, a SYN packet with only 40 bytes takes up 84 bytes of bandwidth when transmitted on the network.After the iPhone enters DFU mode, the general iTunes tool will prompt a warning: "Your iPhone XR has been detected", and then you can resume the swipe. The operation is as follows:In reality, we often encounter multi-classification learning tasks. Some two-classification learning methods can be directly extended to multi-classification, but in more cases, we use two-classification learners to solve multi-classification problems based on some basic strategies. Therefore, the fundamental method of multi-classification problem is still the two-classification problem.感谢书友【魏明林】再次588的慷慨打赏，感谢书友【赏花品玉】【dyw83673046】【牛筋鞑血】【土家族老四】【别人不懂我的倔强】【恶魔小骑士】的慷慨打赏。