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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