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The former is to query a DNS server for a non-existent server, while the latter is to query a real domain name.Fire power supplyThreads a > A and B enter the first if judgment at the same time. B > A enters the synchronized block first, and since instance is null, it executes instance=new Singleton ();经历了两个冒险事件的吴邪从南沙回到杭州后，在修养期间，突然接到了久未谋面的发小老痒的电话。老痒和吴邪讲述了自己三年前在秦岭山腹地的冒险见闻，并邀请吴邪一同前去冒险，再探上古遗迹。吴邪和老痒出发前往了秦岭山脉探险，在这里，他们见到了巨大的哲罗鲑、壮丽的地下河瀑布、不可思议的上古神树…而一直神出鬼没的张起灵，竟也在暗中帮助着吴邪。I nodded at this passage, Understand that what Zhang Xiaobo said is indeed reasonable, It is not a lie, Here I think it is necessary to give you one thing about popular science. So we have to say something digressive: The result of a real bullet hitting a petrol tank is not the same as that shown in most movies. One shot can explode the petrol tank, But this is not the case, Although a pure metal projectile will rub against the air at a speed of hundreds of meters per second to generate equivalent heat, And will produce sparks after hitting the metal oil drum, But none of this is enough to ignite petrol, Especially for gasoline with a large total amount, to ignite gasoline, please remember one thing-open flame must be used. In addition, gasoline is a flammable item, but it is not an explosive item in the true sense. Only after reaching a certain total amount can explosion be caused. If the total amount is insufficient, it can only cause combustion without explosion.影片讲述韩国普通家庭，一家三代生活中的点点滴滴、喜怒哀乐。外婆是个老小孩儿；一生尽忠职守的父亲是个军人，他对四个女儿的家教非常严格。性格迥异的“公主们”每人的名字里都有“七”：大女儿得七（金慧渲饰）二十多岁时就嫁为人夫，性格隐忍的她却遭遇外遇的困扰；二女儿雪七（李泰兰饰）因为父亲的期望而成为一名军官，却因为工作的关系而找不到男朋友；三女儿美七（崔贞媛饰）相貌出众，却不满二姐事事强过她；小女儿停七（申智秀饰）单纯稚嫩，在联考落榜后居然未婚先孕了……本片并非旨在讲述家庭生活中的琐碎，而是展现现代女性的不同人生。　　面对宋建平的果断和行动，林小枫表示包下全部家务，要让他无后顾之忧，以求夫贵妻荣。在林小枫的无私奉献中，宋建平拼搏成功，而林小枫自己却屡屡因为家中琐事耽误了工作而下岗。