The two most common gases used in pneumatic systems are_____.A、oxygen and hydrogenB、oxygen and acetyleneC、helium and nitrogenD、compressed air and nitrogen-易过题库-题库最全的搜题网站

The two most common gases used in pneumatic systems are_____.

Aoxygen and hydrogen

Boxygen and acetylene

Chelium and nitrogen

Dcompressed air and nitrogen

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