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CAD shortcut key refers to the use of shortcut key instead of mouse in CAD software operation for the convenience of users. You can use keyboard shortcuts to issue commands to complete operations such as drawing, modifying and saving. These command keys are CAD shortcuts.本剧主要讲述的是百年企业金玉堂的掌上明珠张涵雁，幼年时因受姐姐刘采凡的妒忌而被姐姐遗弃。被养父母收留后，天使流落人间，她却从未对自己身世有过半点怀疑。或许冥冥中自有定数，一切都因遇到失忆富二代王易男而改变，涵雁逐渐知晓了自己的身世。长大后发现涵雁就是当年的小毓萍，采凡害怕自己拥有的一切被夺走，因此联合语天一并阻挠她认祖归宗。但是最后张涵雁与易男有情人终成眷属的同时，也认祖归宗，并与姐姐化敌为友，一笑泯恩仇。Before that, I read a lot of related articles, and after I have an overall understanding, I will begin to experience it. Before you start work, you should make clear what the event distribution mechanism is to study: the transfer rules of event sequences between ViewGroup/View.话音落地，并无人回答，虞姬嘴角的笑容略微一滞，正要蹙眉疑惑的时候听出了脚步声有些不对。This is original method!But this is not over yet. Ethernet also requires CRC verification when transmitting data. The network card will CRC check the data packet before sending the data, attaching a 4-byte CRC value to the back of the packet header. At this time, the packet length is no longer 40 bytes, but 64 bytes, which is often referred to as SYN packet attack. The packet structure is as follows: