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　　面对国际对于外太空资源抢夺形势的加剧，中国政府决心在太空建立永久性空间站，而宇航员正是这项任务的重要执行者。张天聪不仅是新一代航天员的教官，同时也是他们的竞争者。怀揣着“飞天”之梦的张天聪与所有航天员一起经历着种种常人所不能想象的训练。为了进行失重训练，航天员们远赴俄罗斯加加林航天中心，出色的训练成绩赢得了俄罗斯、美国等同行们的尊重。战国时代，礼崩乐坏。周天子狩猎大典遇刺，七国诸侯与后妃臣公皆有嫌疑。危机四伏，波谲云诡，精心布局的阴谋环环相扣。战火烽烟，诸侯并起，大时代中，秉承理想与信仰的旷世奇才鬼谷子王蝉，踏上了勤王之路，与门生孙膑、庞涓、苏秦、张仪等壮志凌云之士，前赴后继，匡扶正义，拯救天下。　　一心要出人头地的姐姐寄萍忍辱负重，先后拜师学琴书、学京剧，终于学得一身技艺，成为一带名伶，然而，乱世如斯，民主共和、欺世盗国、军阀混战，日寇入侵，留着两撇小胡子，一脸邪笑的张宗昌，还有一个乱世枭雄韩复渠，无一不影响着姐弟倆的生活。出落成美若天仙的姐姐不得不在夹缝寻求生存之道。可是世子妃，为何不直接将她弄走，或者关起来呢？再不然……她犹豫着不知如何说。上回大典发的羊皮靴子倒不错，软和的很，样式又好看，我都舍不得穿。In web development, Picture preloading is a common technique, If you set the src attribute directly to the img tag node, If the picture is larger, Or if the network speed is relatively slow, Before the picture is loaded, The picture will be a blank scene for a period of time. This is not good for the user experience, so at this time we can use a loading loading picture as a placeholder to prompt the user that the picture is being loaded before the picture is loaded. After the picture is loaded, we can directly assign a value to the picture. The following code is as follows when we do not use proxy mode to preload pictures: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: