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

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

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

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2、[多选题]Cache is

• A、high cost
• B、fast
• C、slow
• D、relatively small

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3、[多选题]There are three types of application programs to translate source c ode into object code.They are()

• A、assemblers
• B、interpreters
• C、compilers
• D、application suite

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4、[多选题]With an Internet connection you can get some of the basic services available are：

• A、Usenet news
• B、FTP
• C、E-mail
• D、Telnet

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5、[多选题]A large main memory can be used for storing

• A、interface
• B、applications
• C、data
• D、operating system

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