中国石油大学 / 中石油
正确率:100%
29. Most petroleum products, including ___________________________are fractions of petroleum that have been treated to remove undesirable components.
A、kerosenes
B、fuel oils
C、lubricating oils
D、pitch
E、waxes
A、kerosenes
B、fuel oils
C、lubricating oils
D、pitch
E、waxes
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