_________ have been utilized in thermostats for years. They are mechan – McqOptions

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1.	_________ have been utilized in thermostats for years. They are mechanically connected to a switch, such as a mercury switch, to control heaters.
A.	Unimetal
B.	Bimetallic
C.	Trimetallic
D.	Quadrametallic
Answer» C. Trimetallic

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