Usually, ____ oil from wells is refined by heating it in a closed still.
A、uncovered;
B、unused;
C、crude;
D、unexplored
发布时间：2025-07-02 18:41:05
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答案：crude
相关试题
- 1.Usually, ____ oil from wells is refined by heating it in a closed still.
- 2.Crude oil is safer and healthier than refined oil.
- 3.The earliest diesel fuel was refined from crude oil.
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