Certain gases in air are important natural resources that are used in welding. Two of these gases are _____. A. oxygen and argon B. hydrogen and fluorine C. chlorine and sulfur dioxide D. nitrogen and

Certain gases in air are important natural resources that are used in welding. Two of these gases are _____. A. oxygen and argon B. hydrogen and fluorine C. chlorine and sulfur dioxide D. nitrogen and carbon dioxide

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