单选题A tank has been sealed and unventilated for a long period of timeWhich of the following conditions does this indicate?（）AThe tank is safe to enterBThe tank is especially dangerous to enterCCarbon monoxide is presentDWater vapor present when the tank was sealed has oxidized
单选题
A tank has been sealed and unventilated for a long period of timeWhich of the following conditions does this indicate?（）
A
The tank is safe to enter
B
The tank is especially dangerous to enter
C
Carbon monoxide is present
D
Water vapor present when the tank was sealed has oxidized
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