Automation System
An operational amplifier:

All of these
None of these
uses the principle of feedback
can be used to subtract two or more signals
can be used to sum two or more signals

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Automation System
A semi-continuous operation means:

None of these
each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
the operation is continuous each shift, but stops between shifts
a computer is a required part of the machine
coffee breaks are allowed for the operator

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