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Python Reference Manual: This book is only used as a reference book. When you encounter a problem, turn over the book and consolidate it (of course, the fact may be that you went directly to Google). This kind of book does not need to be brushed from beginning to end, but only needs to be checked and filled (e-books are fine)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:FBI女探员奥莉维亚•德纳姆（Anna Torv 安娜•特弗 饰）精明干练，她刚刚和同事约翰•斯科特（Mark Valley 马克•维利 饰）确立恋爱关系，然而却在某次调查中痛失爱人。奥莉维亚随后被招入专门负责离奇案件的“边缘档案部门”。在此之后，各种匪夷所思事件接连发生，种种迹象表明，这一切似乎与被世人称为“当代爱因斯坦”的沃尔特•贝肖普博士（John Noble 饰）以及资力雄厚、背景神秘的巨力公司有关。随着调查的深入，事件背后的黑幕和秘密逐渐显露出来……而且这部电影的立意，也非常纯粹，就是弥补遗憾。The design stage of subway station comprehensive pipeline lags behind the design stage of civil engineering, wind, water and other pipeline schemes, and the design of comprehensive pipeline shall be specialized in civil engineering, wind, water and other pipelines.　这样，坑内人的头部完全在地面之下，再把土填进去，除非扒开灌木仔细查看地面，否则便是用刀剑木棍扫过，也不能发现下面暗藏玄机。