______crude hydrocarbons into such products as gasoline and petrochemicals is at the heart of the petroleum industry.

admin2019-07-01  39

问题 ______crude hydrocarbons into such products as gasoline and petrochemicals is at the heart of the petroleum industry.

选项 A、Refine
B、Are refined
C、By refining
D、Refining

答案D

解析
转载请注明原文地址:https://jikaoti.com/ti/FQhYFFFM
0

随机试题
最新回复(0)