A tank has been sealed and unventilated for a long period of timeWhich of the following conditions does this indicate?()
If there has been a fire in a closed unventilated compartment it may be unsafe to enter because of ().
If there has been a fire in a closed unventilated compartment it may be unsafe to enter because of ().
A tank has been sealed and unventilated for a long period of timeWhich of the following conditions does this indicate?()