nengliangli4480 nengliangli4480
  • 15-02-2024
  • Engineering
contestada

What requirements apply to a main gas shutoff valve that controls several gas piping systems?
a) It must be located indoors only
b) It must be accessible only to authorized personnel
c) It must be capable of shutting off gas to all systems simultaneously
d) It must be painted with a specific color for identification

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