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?8568.The primary difference between aviation breathing oxygen and other types of commercially available com- pressed oxygen is that

发布于 2021-02-18 22:12:09

【单选题】
A ?the other types are usually somewhat less than 99.5 percent pure oxygen.
B ?aviation breathing oxygen has had all the water vapor removed.
C ?aviation breathing oxygen has a higher percentage of water vapor to help prevent drying of a person's breathing passages and possible dehydration.

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步云☁️ 2023-02-18

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