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emmybay02 emmybay02
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6 years ago
Arc burn is caused by:
 
  A) Ultraviolet rays B) Infrared rays C) Visible rays D) All of the above

 Q. 2

Valves installed at the highest point in the system are called _____.
 
  a. check valves
  b. bleeder valves
  c. top valves
  d. traps
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leahx3leahx3
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emmybay02 Author
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6 years ago
Such an awesome helper!
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