The characteristic of fuel-gas fittings that differentiate them from other types of fittings is fuel-gas fittings

_____.

a. have right-hand threads
b. have left-hand threads
c. require lubricant for a proper seal
d. require PTFE tape for a proper seal


b

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Indicate whether the statement is true or false

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What will be an ideal response?

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The valence shell of an atom is the _____ shell.

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