Oxygen is stored at more than _____ pounds per square inch (psi) in hollow steel cylinders.

a. 500
b. 1,000
c. 1,500
d. 2,000


d. 2,000

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Which of the following describes materials that transfer heat quickly?

a. insulators b. good conductors of heat c. quick conductors of heat d. none of the above

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Electric and magnetic fields both result from voltage potentials and _________

A. Radio frequencies B. Audio frequencies C. Current flows D. Electric charges

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What is the minimum measurement for a ventilation opening cut in a roof?

a. 5 ft by 5 ft b. 6 ft by 6 ft c. 6ft by 8 ft d. 4ft by 4 ft

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Early hydronic systems did not have circulators. Instead, they relied on the ____ of hot water to move water between the boiler and the heat emitters.

a. molecular attraction b. thermonics c. hydraulics d. buoyancy

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