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
The computer sends signal in the form of ______.
A．electrical impulses
B．machines
C．instructions
D．automatic impulses
单项选择题
Each of those machines in the past can only perform ______.
A．many operations
B．two operations
C．a single operation
D．none of operations
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