The simplest form of backflow preventer is the _____.
a. atmospheric vacuum breaker
b. dual-check valve backflow preventer
c. air gap
d. pressure-type vacuum breaker
c. air gap
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Muscle _____ requires energy.
Fill in the blank(s) with the appropriate word(s).
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-51 + 37 =
A) 14 B) -14 C) -88 D) 88
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To protect piping from nail punctures, where can it be placed?
A. next to a stud B. next to a joist C. in the middle of the wall or ceiling D. nowhere
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Fiberglass, plastic, and ____ sinks are not easily recycled.
A. cast iron B. metal C. solid china D. porcelain
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