单选题When carrying a cargo of asphalt or molten sulfur，which are carried at temperatures of over 300°F，one of the biggest dangers is（）.Awater in the tanks or pipelinesBhaving the cargo too coolCexplosion of vapors after dischargeDinadequate ullage space
单选题
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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