The most common heating fuel in the United States is _____

a. gas
b. fuel oil
c. electricity
d. coal


a

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To conserve space on the print, and to save time in preparing the drawing, a note is often shown as a(n) ____.

A. sign B. symbol C. mark D. icon

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If a wood product is to be stained and varnished, ____ is often used as a sealer over the stain.

A. shellac B. lacquer C. latex D. polyester

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What does a flashback arrestor do?

A) Helps to curb the cost of welds B) Restricts the flow of gas C) Prevents gas loss D) Prevents a flashback E) Mixes the gas equally

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Noncondensable gases ____.

A. are desirable in a refrigeration system B. are undesirable in a refrigeration system C. condense readily under normal atmospheric conditions D. help in pulling a vacuum

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