The kernel is the(66)of an operating system such as Windows98, Windows NT, Mac OS or Unix. The kernel provides basic services for the other parts of the operating system,(67)it possible for it to run several programs at once(multitasking), read and write files and connect to networks and peripherals. Applications and utility programs use the services provided by the kernel to provide practical business functionality.

In operating systems such as Windows or most versions of Unix, the kernel(68)everything except application and utility programs.

In microkernel operating systems such as Digital Unix and Apples forthcoming Mac OS Server, the kernel(69)supports only multitasking and memory management. Other services such as applications, utilities and the user interface support device drivers, API and graphics which all(70)outside the microkernel.

A．nucleus

B．center

C．core

D．heart

[名词解释] 内核（kernel）

[单选题]User programs interact with the kernel through a set of standard(71). They request services to be provided by the kernel. Such services would include accessing a file: open close, read, write, link, or execute a file; starting or(72)accounting record

[单选题]卷积核(kernel)又被称为()。A．滤波函数B．重建算法C．分辨率D．噪声指数E．滤过投影

[单选题]卷积核（kernel）又被称为（）A . 滤波函数B . 重建算法C . 分辨率D . 噪声指数E . 滤过投影

[单选题]An operating system is ( ).A.the highest layer of softwareB.the lowest laye

[名词解释] linux operating system

[单选题] （73）is the application of planned, systematic quality activities to ensure that the project will employ all processes needed to meet requirements.（73）A． Quality assurance (QA)B． Quality planningC． Quality control (QC)D． Quality costs

[单选题]The main function of the lubrication system in to enable （） of a film of oil between the moving parts.A . the informationB . the formationC . the scatterD . the frictio

[单选题] An embedded operating system is the（71） program that manages all the other programs in an embedded device after initial load of programs by a(an) （72）. It normally guarantees a certain capability within a specified（73） size and （74） constraint as we

[单选题] As an operating system repeatedly allocates and frees storage space, many physically separated unused areas appear. This phenomenon is called （71） .（71）A． fragmentationB． compactionC． swappingD． paging