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NGA 20D Book Exam Questions & Answers Latest Updated Guaranteed A+ Guide
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December 2025
2025/2026
A+
NGA 20D Book Exam Questions & Answers Latest Updated Guaranteed A+ Guide
When evaluating any gas leak indication, - Answer- the initial step is to determine the perimeter of the leak area.
When the perimeter extends to a building wall, - Answer- the investigation should continue into the building.
Where petroleum or propane gas is involved, - Answer- special attention should be given to the basement or other low areas. Other equipment may be used to determine if propane or petroleum gas...
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