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On personal computers, there are five most commonly used operating systems: DOS, Windows, Unix/Xenix, and OS/2. DOS System-In the 17 years since its inception in 1981, DOS has undergone 7 major version upgrades, from version 1.0 to version 7.0 now, continuously improving and perfecting. Windows System-Windows is the first generation of window visual interface published by Microsoft in November 1985, which makes PC enter the so-called GUI (Graphical User Interface) stage. Unix system. Unix systems were initially used on small and medium-sized computers. Unix is a multi-user system, which generally requires more than 8M of memory and a large capacity of hard disk. Linux system-Linux is the largest free software in the world at present. It is an operating system with functions comparable to UNIX and Windows and has complete network functions.尹旭已经将小女孩揽在臂弯，正要挺腰坐回马背时，察觉到劲箭飞来。27Over the years, I have traveled tens of thousands of kilometers on donkeys, horses and motorcycles, and have interviewed many such stories about border protection.Tor 是一名私生子，一天，母亲带着他来到父亲家门前，希望父亲能够收留无家可归的母子两人，可是那天父亲不在家，开门的是父亲的正房，两人遭到了正房非人的对待，最终，母亲含恨而死。而 Tor 则被姗姗来迟的父亲领进家门，开始了寄人篱下饱受欺凌的生活。 唯一对 Tor 好的，是邻居家的女儿 Mingta，但 Mingta 能够带给 Tor 的温暖毕竟是有限的。一场意外中， Tor 坠入海中，继母以为他已经死了，可实际上，他幸运的被好心人所救。一晃眼十几年过去， Tor 隐姓埋名再度回到了继母的身边，他的目的只有一个，那就是复仇。9-2 Three Restaurants: Create three instances of the class you wrote to complete Exercise 9-1, and call the method describe_restaurant () on each instance.1938年，10岁的德国男孩安东不再想成为局外人。一心想加入希特勒青年团，但遭到了父亲的坚决反对，以致演变成了一场家庭冲突。当犹太邻居向他的家人寻求保护时，安东看到了纳粹的恐怖之处。于是他偷偷向他的同志们寻求建议——这让他的父亲陷入了极大的困境。