To ensure correct direction of refrigerant flow in heat-pump-style room air conditioners, ____ are included in the unit.
A. filter drivers
B. globe valves
C. quarter-turn valves
D. check valves
Answer: D
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Within an atom, which of the following is a negatively charged particle that rotates around the nucleus?
a. proton b. neutron c. electron d. pluton
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The ____________________ controls line pressure in the system.
Fill in the blank(s) with the appropriate word(s).
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____________________ is a good substitute for corn
Fill in the blank(s) with the appropriate word(s).
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Beekeepers use a smoker on a hive to ________ the bees inside
a. Anger c. Disorient b. Blind d. Kill
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