Dr. Ward experimented by growing plants _____

A) ?in many different weather conditions
B) in pots of different materials
C) in different temperatures indoors
D) in a variety of pot sizes


D

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When installing faced insulation in a wall that will have a separate vapor barrier installed, the staples should be fastened to the wall frame _____.

a. on the faces of the wall studs, top plate, and sole plate b. on the inside surfaces of the wall studs, top plate, and sole plate c. only to the top plate and sole plate d. only to the faces of the wall studs

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Based on the latest industry standards; must the oil be changed in a hermetic compressor on a close-coupled reach-in unit when retrofitting R12 with R401A?

a. Yes, you must always change from mineral oil to alkylbenzene on a retrofit. b. No, because it has been found that the oil will actually return to the compressor. c. It depends on what refrigerant you are using to retrofit the unit.

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Rough spots or looseness encountered when rotating the motor shaft may indicate _____

a. bearing problems b. sealing problems c. excessive leakage d. worn out bellows

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Pin 2 of a 555 timer must be connected to a voltage that is less than 1/10 Vcc (the applied voltage) to trigger the unit.

Answer the following statement true (T) or false (F)

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