For energy conservation, materials with high thermal mass are effective in climates in which the heat flow through the building envelope is

A) absent during a large part of the year.
B) bidirectional within a 24-h period during a large part of the year.
C) unidirectional within a 24-h period during a large part of the year.


B) bidirectional within a 24-h period during a large part of the year.

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Nuts, bolts, and jar lids are examples of _____

A) screws? B) wheels? C) gears? D) levers

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On the heating plan, a solid line indicates ____ pipes.

A. lead B. water C. supply D. return

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DeMorgan's theorem can be repeated in the same logic expression

Indicate whether the statement is true or false

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A vacuum pump is used by a technician to:

A. Remove air from the system after repairs have been performed B. Remove moisture from the system after repairs have been performed C. Remove refrigerant from the air conditioning system D. Both A and B are correct

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