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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单项选择题
What was the origin of the traditional image of robot
A．Welding car.
B．Computer.
C．Machine.
D．Science fiction.
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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