[多选题] To enhance performance of a computer system we should_

1、[单选题]Electronic commerce may be defined as the entire set of processes that suport()activities on a(n)()and involve information analysis.

• A、society,human
• B、personal,society
• C、commercial,network

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2、[多选题]In order to increase our computer’s performance we need to

• A、have a much larger main memory
• B、have a L2 cache
• C、buy a L2 cache
• D、buy a L1 cache

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3、[多选题]What make it is difficult to agree on how to count viruses?

• A、new virus arise from an existing virus
• B、some viruses can use polymorphic technique
• C、just a trivial change may creaｔe a new virus
• D、some viruses can creaｔe different versions when they infect other programs

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4、[多选题]With middleware we can

• A、allow computations to communicate with one another
• B、keep computations largely isolated from undesirable interactions
• C、run programs on a centralized computer system only
• D、run programs on different computer system

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5、[多选题]The two most common types of scanners are()and()

• A、hand-held scanners
• B、handler scanners
• C、flatbed scanners
• D、auto scanners

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