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18.At lower resolutions, text and other objects appear smaller. ( )

A. 正确

B. 错误

查看题目

79.File ____ shrinks the size of a file so it requires less storage space. ( )

A. 　compression

B. 　defragmenting

C. 　synthesizing

D. 　scanning

查看题目

98.Wireless signals can be disrupted by ____. ( )

A. 　interference from electrical appliances

B. 　hills, valleys, trees

C. 　brick walls and concrete floors

D. 　all of the above

查看题目

93.Most antivirus software runs ____. ( )

A. 　on scheduled dates

B. 　only when you choose to run it

C. 　continuously whenever your computer is turned on

D. 　continuously even if your computer is turned off

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3.RAM is a temporary holding area for data, application program instructions, and the operating system.( )

A. 正确

B. 错误

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4.Most computers include a CD drive or DVD drive that uses a magnet to read data stored on plastic-coated CDs and DVDs.} ( )

A. 正确

B. 错误

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8.Software applies ____, also called algorithms(算法), to process data. ( )

A. 　procedures

B. 　objects

C. 　rules

D. 　arithmetic

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2.The series of instructions that tell a computer how to carry out a processing task is referred to as a(n) computer program. ( )

A. 正确

B. 错误

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13.A proprietary version of MP3, designated as ____, is used for iTunes music. ( )

A. 　MP4

B. 　P4M

C. 　PM4

D. 　M4P

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50.For protection against power outages, you can connect your computer to a( ) ____ power supply that offers battery backup along with surge protection. ( )

A. 　uninterruptible

B. 　corrupt-proof

C. 　interruptible

D. 　metered

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