A tank has been sealed and unventilated(不通风的) for a long period of time. Which of the following conditions does this indicate?A.The tank is safe to enterB.The tank is especially dangerous to enterC.Carbon monoxide(一氧化物) is presentD.Water vapor present when the tank was sealed has oxidized(使氧化)
A tank has been sealed and unventilated(不通风的) for a long period of time. Which 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(一氧化物) is present
D.Water vapor present when the tank was sealed has oxidized(使氧化)
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