[单项选择]Stack is quite simple. Many computer systems have stacks built into their circuitry. They also have machine-level instructions to operate the hardware stack. Stack is ______ in computer systems.
A. useless
B. not important
C. simple but important
D. too simple to be useful

[单项选择]Stack is quite simple. Many computer systems have stacks built into their circuitry. They also have machine-level instructions to operate the hardware stack. Stack is（）in computer systems.
A. useless
B. not important
C. simple but important
D. too simple to be useful

[单项选择]Computer systems consist of two very different types of elements: (71 ) , which includes all the physical things that can be touched and Software, which tells the hardware how to do.
A. Operating system
B. I/O devices
C. Courseware
D. Hardware

[单项选择]Most computer systems are (26) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (27) to an outsider attack by preventing (28) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (29) 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 (30) by tools referred to as Intrusion Detection Systems.

A. vulnerable
B. week
C. sensitively
D. helpless

[单项选择]

Most computer systems are (66) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (67) to an outsider attack by preventing (68) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (69) 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 (70) by tools referred to as Intrusion Detection Systems.

（66）处填（）。
A. vulnerable
B. week
C. sensitively
D. helpless

[单项选择]

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．

 

（74）处填（）。
A. power
B. rights
C. authorized
D. common