When carrying a cargo of asphalt or molten sulfur，which are carried at temperatures of over 300°F，one of the biggest dangers is（）.<br>A:water in the tanks or pipelines<br>B:having the cargo too cool<br>C:explosion of vapors after discharge<br>D:inadequate ullage space

When carrying a cargo of asphalt or molten sulfur，which are carried at temperatures of over 300°F，one of the biggest dangers is（）.
A:water in the tanks or pipelines
B:having the cargo too cool
C:explosion of vapors after discharge
D:inadequate ullage space

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