单项选择题

TCP/IP refers to a suite of ( ).
units
C、application programs
D、data communication protocols

A、system
B、control
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To download a file from a remote FTP server, you can ( ).the command promptB、type 'ftp' in brower's address columnC、click on the FTP icon to see if the client is presentD、All above
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Database management system(DBMS) programs are designed to work with data that is logically structured or arranged in a particular way, known as ( ).modelB、databaseC、informationD、data
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( ) is not the operation of Excel.PainterC、Customizing ToolbarD、Undo
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