________ use(s) changes in direction between anchor points to account for thermal expansion

A) Flexible couplings B) Cold springing
C) Expansion loops D) Flexibility in layout


D

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Use an anti-seize compound on spark plugs installed in ____________________ cylinder heads.

Fill in the blank(s) with the appropriate word(s).

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A normally closed push button ____.

a. is generally used to represent a start button b. has only one pole c. is generally used to represent a stop button d. is referred to as common

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A substance that can dissolve metals and burn flesh is classified as:

A. Corrosive B. Reactive C. Inert D. Toxic

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The HVACR technician's role in indoor air quality is to:

A) Perform laboratory tests on collected material. B) Install HEPA filters to alleviate all indoor air-quality concerns. C) Communicate with the building owner and the occupants on how the interacting systems of a building affect indoor air quality. D) Perform microscopic analysis to determine the origin of pollutants.

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