操作系统在计算机系统中处于何种地位？

在计算机系统中操作系统处于什么地位？

操作系统在计算机系统中处于何种地位？操作系统的作用是什么？

在计算机系统的层次结构中，操作系统位于第几层？

计算机操作系统的类型，有（），网络操作系统，分时操作系统，批处理操作系统，实时操作系统等。

假设某计算机指令长度为20位，具有双操作数、单操作数和无操作数3类指令格式，每个操作数地址规定用6位表示。问：若操作码字段固定为8位，现已设计出m条双操作数指令，n条无操作数指令，在此情况下，这台计算机最多可以设计出多少条单操作数指令？

（） are individuals and organizations that are actively involved in the project, or whose interests may be affected as a result of project execution or project completion.

Project selection methods involve measuring value or attractiveness to the project owner or sponsor and may include other organizational decision criteria （）is not a project selection method.

你熟悉哪些操作系统？想一想你在使用计算机过程中，操作系统如何提供服务？

（75）are individuals and organizations that are actively involved in the project，or whose interests may be affected as a result of project execution or project completion.

are individuals and organizations that are actively involved in the project，or whose interests may be affected as a result of project execution or project completion．

在计算机指令系统中，确定操作数有多种方法。当操作数直接由指令给出时称为（）。