Automation System
A technique for displaying applications where complex 3-D geometric are required for the exteror shall of a product is called:

None of these
3-D modeling
surface modeling
solid modeling
2-D modeling

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Automation System
Time proportioning control:

cannot use a TM990 micro¬computer
None of these
can be used on a PM550 programmable process controller
is less efficient than normal PID control
a and b above.

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Automation System
Semiconductor devices:

None of these
All of these
usually have a very short MTBF (mean time between failure)
are less reliable than electro¬mechanical components
have a very short infant mortality period

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