Deck : Safety - 618/2841
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| « Previous Question |
| Normally, the percentage of oxygen in air is __________. |
| A) 16% |
| B) 18% |
| C) 21% |
| D) 25% |
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| There are no comments for this question. |
| Deck : Safety - 618/2841
|
|---|
| « Previous Question |
| Normally, the percentage of oxygen in air is __________. |
| A) 16% |
| B) 18% |
| C) 21% |
| D) 25% |
| Comments |
|---|
| There are no comments for this question. |