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The four operating principles of automatic sprinklers demand that they be:
A.
mechanically simple, require little maintenance, be reliable in operation, and free from premature operation
B.
rugged, mechanically simple, reliable in operation, and free from premature operation
C.
reliable in operation, free from premature operation, capable of operation in a multitude of environments, and capable of extinguishing the involved materials
D.
mechanically simple, rugged, require little maintenance, and free from premature operation
The answer is B: Rugged, mechanically simple, reliable in operation, and free from premature operation. This can be found on page 16-28.
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lengocho
4 months agoChris_S723
9 months, 4 weeks ago