Automation System
The axis of movement of a robot may include:

Wrist rotation
None of these
All of these
elbow rotation
X-Y coordinate motion

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Automation System
Relay ladder logic is used in a PC because:

None of these
it is impossible to write a control program for a machine in any other logic
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
All of these
it is the best industrial control language ever developed.

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Automation System
Vision sensors:

None of these
can not improve much in the next decade
will remain very costly
will more closely match the capabilities of the human eye
All of these

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