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

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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