单项选择题

________ manages the other components of a computer system．

A．Bus
B．Application system
C．Operating system
D．Disk
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单项选择题
________ is a device that allows a computer to transmit information over a telephone line．
A．Disk
B．Modem
C．Printer
D．Disp1ay
单项选择题
________ devices are interface of man and machine．
A．I/O
B．Memory
C．Disk
D．Printer
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