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.
Every year we export almost 85 percent more agricultural goods than we import
Indicate whether the statement is true or false
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
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).