There are many types of systems software, but two types of systems software are central to every computer system today: an operating system and a complier.
絣有许多类型的软件系统， 但是对于今天，每种计算机系统以两种系统软统软件为中心： 操作系统和编译器。
As servers run different types of software and do not function in the same manner, there isn't a simple method for creating custom error pages that will work with every system.
由于服务器管理不同类型的软件，在同一种方法下不会发挥功能，所以没有出现一种简单方法，能创造出应付各种系统的错误页面。
Simulation and comparison studies of different peak and valley time price policies and different response types of users are carried out by simulation software VENSIM special for system dynamics.
应用系统动力学专用的仿真软件VENSIM对不同峰谷分时电价定价策略和不同响应类型用户进行仿真和比较研究。
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