[单选题] ＿＿＿＿＿＿＿＿printers are being phased out and replaced by prin ters that can produce clean type.

1、[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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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]Information stored in semiconductor RAM is

• A、volatile
• B、permanent
• C、non volatile
• D、non permanent

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4、[多选题]The three desiderata of memory system are

• A、closely approximated today
• B、Less approximated tomorrow
• C、exclusive
• D、independent

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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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