单选题A tank which has been sealed for a long period of time can be dangerous because （）.Asteel surfaces consume oxygen by rustingBsealed tanks usually form a vacuumCmoisture condenses in the tank, displacing the oxygenDmost tank coatings give off poisonous vapors in the presence of moisture
单选题
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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