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After creating some subclasses of Pizza, you can start testing:A complete computer system consists of hardware and software. As the name implies, hardware is the physical equipment that can be seen and touched in the computer, such as the host computer. Software, on the other hand, is relative to hardware. It refers to various programs and related documents needed to run on the computer, such as a drawing software or a gobang game. Computer hardware and software are indispensable. Hardware is the material basis on which software can work and is the "body". Software is the soul of the computer and the core of controlling and operating the computer. They complement each other and form a complete computer system. From the appearance, the computer includes: monitor, host computer, keyboard, mouse and sound box.有些事情关系就复杂多了。在寻找过程中，卫斯理面对同甘共苦的知心爱人白素，和与其有着莫名情愫的方天涯，陷入了两难境地。亲卫军将领注意到韩元帅的脸色越来越阴沉，甚至额头上已经有了微微的汗珠。他与平武可谓荣辱与共，不禁大为担忧，有些后悔这个草率的决定。　　而在这一过程中，具有特殊政治意义的南京国民政府成为了两党争夺的重点。新九师参谋长梁一桐在接收南京的过程中遭汪伪头目周佛海陷害，危急时刻幸而得到恩师杨百川父女的救助。回到部队的梁受到百般折磨，他也借此苦肉计上演投诚国军的好戏。