Which leak detectors can be used with systems that are only charged with nitrogen?
A) Heated diode electronic detectors B) Ultrasonic leak detectors
C) Infrared detectors D) Corona discharge electronic detectors
B
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What cutting fluid should be used when tapping threads to a cast iron block?
A. dry B. soluble oil C. water D. lard
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Explain the differences between coal tar and asphalt as roofing bitumen, and state why coal tar is not commonly used.
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? Identify and state the historical significance of Handsome Lake.
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An important part of the consultation is to determine whether or not the home maintenance for a service fits the client's .... :
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