For most standard refrigeration systems some type of head pressure control is required if the condensing temperature goes below ___.
a. 32° b. 90° c. 105° d. 125°
b. 90°
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People began to use chemicals to control insect pests in the early 20th century
Indicate whether the statement is true or false
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Where necessary, to prevent heat loss through the floor and foundation walls, ____made of extruded polystyrene is installed under the concrete slab.
a.a vapor barrier b.rigid insulation c.a seal d.tarpaulin
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The combined desk telephone and the Hoover Model 150 upright vacuum cleaner were both designed by ____.
A. Henry Dreyfuss B. Raymond Loewy C. William Morris D. Walter Gropius
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A catalytic converter has to be at least how hot before it begins to work?
A) 1,500°F B) 1,000°F C) 2,000°F D) 500°F
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