[多选题] A digital computer is generally made up of five dstinct elements:a central processing unit,().

1、[多选题]The web browsers which is normal used,such as＿＿＿＿＿＿＿＿＿＿.

• A、ICQ
• B、Opra
• C、Firefox
• D、Internet Explorer
• E、Apple Safari

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2、[多选题]Active Directory can help you().

• A、manage every resource with a single logon
• B、build a complex international network
• C、get off the limits of down level networks
• D、deliver complete enterprise security by itself

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3、[多选题]Viruses can delay their attack for().

• A、months
• B、weeks
• C、days
• D、years

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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]A program is a sequence of＿＿＿＿＿＿＿＿that can be eｘecuted by a computer.It can either be built into the hardware or exist inde pendently in the form of＿＿＿＿＿＿＿＿.

• A、data
• B、hardware
• C、instructions
• D、software

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