In a time-sharing operating system, when the time slot given to a process is completed, the process goes from the running state to the __________

A. Disk drive size

B. IP address

C. Acceptable outage time

D. Operating system version

on an automatic system for analyzing risks.

A．Y

B．N

C．NG

s. The kernel of UNIX is the(71)of the operating system: it allocates time and memory to programs and handles the filestore and communications in response to(72). The shell acts as an(73)between the user and the kernel. When a user logs in, the(74)program checks the username and password, and then starts another program called the shell. The shell is a command line(75)(CLI). It interprets the commands the user types in and arranges for them to be carded out. The commands are themselves programs: when they terminate, the shell gives the user another prompt(% on our systems).

A．hub

B．center

C．core

D．nucleus

For users, microkernel technology promises(90), compact and sophisticated operating systems that are typically(91)across a range of hardware platforms. These operating systems will be customizable to let users run multiple operating system and application "personalities" on top of a single microkernel(92).Microkernel based systems can provide this flexibility because the core operating system functions are(93)from the large number of utilities, features and extensions that are layered on top of them. As a result, updating and maintaining operating system is easier, since developers don't have to modify the(94)every time they must acid a new feature.

A．slow

B．fast

C．quickly

D．speed

operating system to allow the computer to communicate with the device．

A．application

B．software

C．driver

D．files