When reassembling a valve, handle ________ carefully to avoid ...

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When reassembling a valve, handle ________ carefully to avoid nicking or damaging them.
 
  A) flanges and gaskets B) seals and O-rings
  C) solenoids and electrical leads D) locks and tags

Question 2

When working in a confined space where concentrations of harmful substances are very high, why should atmosphere-supplying respirators be worn?
 
  A) To supply clean breathing air from a compressed air source
  B) To enable asphyxiation to occur in a very short time
  C) To circulate odorless, tasteless, invisible refrigerants
  D) To purify air of harmful dust, mist, metal, fumes, and vapors

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Answer to Question 1

B

Answer to Question 2

A

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