内存地址从AC000H到C7FFFH，共有(3)个地址单元，如果该内存地址按宇(16bit)编址，由28块芯片构成。已知构成此内存的芯片每片有16K个存储单元，则该芯片每个存储单元存储(4)位。

(50)

(81)

(80)

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(78)

Most computer systems are (71) to two different groups of attacks：insider attacks and outsider attacks．A system that is known to be (72) to an outsider attack by preventing(73) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (74) users．Detecting such abusive usage as well as attacks by outsides not only provides information on damage assessment,but also helps to prevent future attacks．These attacks are usually (75) by tools referred to as Intrusion Detection Systems．

(77)

(76)

(73)

(75)

对象是面向对象开发模式的(47)。每个对象可用它自己的一组(48)和它可执行的一组(49)来表征。应用执行对象的(49)可以改变该对象的(48)。

(74)

(72)