Automation System
Actuators are used to:

All of these
activate a chemical
sense an object
None of these
make a mechanical movement

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Automation System
A semi-continuous operation means:

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

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