99.5% purity oxygen is used in_____________________?
Correct answer: A. All A, B, and C.
- A. All A, B, and C.
- B. Hospitals for medicinal purposes
- C. Gas masks and artificial breathing apparatus
- D. Cutting and welding by oxy-acetylene flame
Explanation
High-purity oxygen is used with acetylene for cutting and welding, supplied medically, and used in breathing apparatus. Therefore all three listed applications are valid.
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