In order to prevent a duct-mounted electric heater from being energized when the fan is not on, an ____________________ should be used.

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


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Name the primary difference between a pump and a compressor.

a. Compressors use steam turbines vs. electric motors b. Pumps transfer fluids, compressors transfer gases. c. Pumps are smaller than compressors. d. Compressors transfer gases, pumps transfer liquids.

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Every year we export almost 85 percent more agricultural goods than we import

Indicate whether the statement is true or false

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Soils of good tilth and high productivity are usually characterized by stable aggregation and a high percentage of macropores

Indicate whether the statement is true or false

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In a multiple axis position system, the ____________________ and ____________________ movements are horizontal and the ____________________ axis is vertical.

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

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