单项选择题

What kind of robots does the man refer to

A．Agricultural robots.
B．Industrial robots.
C．Computers.
D．Electrical robots.
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单项选择题
What does the man need to do to see the page numbers
A．To print the document.
B．To use a new printer.
C．To reset the computer.
D．To press some buttons.
单项选择题
The computer sends signal in the form of ______.
A．electrical impulses
B．machines
C．instructions
D．automatic impulses
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