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On the right side of the form in Figure 1 is a QCalendarWidget component, which displays dates in the form of a calendar and can be used for date selection. QCalendarWidget has a signal selectionChanged (), which is transmitted after the date selected on the calendar changes. Create a slot function for this signal and write the following code:El Internado (Spanish, The Boarding School) is a Spanish television drama thriller focusing on the students of a fictional boarding school in a forest, where teenagers are sent by their parents to study. The boarding school is situated in a forest far from the city, on the outskirts on which macabre events occur. The series debut on 24 May 2007, and is a production of Antena 3.　　刘关张与朱俊、孙坚进攻黄巾，大胜。朱俊、孙坚皆受封赏，只有刘备被冷落。过了很久，刘备才被封为定州中山府安喜县尉。到任四月，督邮来县巡视，刘备出城迎接，极为谦恭。而越王勾践元年（前496），吴王阖庐听说允常逝世，就举兵讨伐越国。越王勾践派遣敢死的勇士向吴军挑战，勇士们排成三行，冲入吴军阵地，大呼着自刎身亡。吴兵看得目瞪口呆，越军趁机袭击了吴军，在檇李大败吴军，射伤吴王阖庐。阖庐在弥留之际告诫儿子夫差说：“千万不能忘记越国。” 三年（前493），勾践听说吴王夫差日夜操练士兵，将报复越国一箭之仇，便打算先发制人，在吴未发兵前去攻打吴。范蠡进谏说：“不行，我听说兵器是凶器，攻战是背德，争先打是事情中最下等的。阴谋去做背德的事，喜爱使用凶器，亲身参与下等事，定会遭到天帝的反对，这样做绝对不利。”越王说：“我已经做出了决定。”于是举兵进军吴国。吴王听到消息后，动用全国精锐部队迎击越军，在夫椒大败越军。越王只聚拢起五千名残兵败将退守会稽。吴王乘胜追击包围了会稽。话已至此，她也差不多明白了事情大概，见王管家一脸郁闷的模样，再看看对面那个一脸无害、笑得纯真无邪的小妹子，差点想要仰天大笑三声。范依兰嫣然一笑，父亲到底还是疼爱自己，当即说道：爹爹，越国那边有消息了。In order to improve the sending efficiency and generate more SYN waiting queues at the server, when the attack program fills the header, neither the IP header nor the TCP header is filled with optional fields, so the length of the IP header is exactly 20 bytes, and the TCP header is also 20 bytes, totaling 40 bytes.