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The server's valid reply to the PING command can be one of the following three replies:TCP is connection-oriented, and a connection must be established between either side before sending data to the other. In TCP/IP protocol, TCP protocol provides reliable connection service, and the connection is initialized by three-way handshake. The purpose of the three-way handshake is to synchronize the serial numbers and acknowledgement numbers of both parties and exchange TCP window size information. The process of shaking hands can be represented by the following figure1947年初，解放军华东部队在苏北七战七捷后，进行战略性转移，一营高营长率领部队北撤，在山东桃村集结待命。不少战士和老乡都想不通，高营长和女村长赵玉敏耐心给大家做工作。此时蒋军共出动25个师的兵力，企图造成南北夹击。我军在桃村大沙河阻击南线敌人六昼曰，主力部队集中到风凰山围歼北线的国民党李军长率领的七个师。高营长接到师长命令抢占摩天岭高地，以阻击敌军张军长率领的增援部队，李军长率领的部队已被我军全歼并活捉李军长。高营长又率领部队乘胜追击张军长率领的部队，赵村长也带领游击队配合主力部队，切断敌人退路，又绞断敌人企图炸毁桥梁的炸药导火线，保住了大桥。一场大战开始了。When we chat with the purchasing company, we often pay great attention to the content of the conversation and always say that there is no topic. In fact, we should pay attention to the process and atmosphere of our conversation. If we had a pleasant and harmonious chat that day, our feelings would be very close. After many days, we often forget what we were talking about at that time, only remember when we had a good chat. In fact, the same is true for purchasing. We will give him a quotation for the price, we will give him a certificate of quality recognition for the quality, and we will stamp and sign it back to him at the delivery date. Therefore, we only need to talk about things other than business and the best questions that he is interested in.她肤色白净，只是眼睛有些小，鼻子稍显矮。素谨似有所觉，转回头看见他，顿时颤抖起来。