
| Engine_2014 : Engineering Safety - 188/2355 |
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| A tank which has been sealed for a long period of time can be dangerous because __________ . |
| A) steel surfaces consume oxygen by rusting |
| B) sealed tanks usually form a vacuum |
| C) moisture condenses in the tank, displacing the oxygen |
| D) most tank coatings give off poisonous vapors in the presence of moisture |
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