减压井是什么?它的工作原理如何?什么时候才能完工?
What is a relief well, how does it work, and when will it be completed?
问题在于柴油机的工作原理是什么,它同汽油机有何区别。
The question is how a diesel engine works and how it differs from a gasoline engine.
问题在于柴油机的工作原理是什么,它同汽油机有何区别。
The question is how a diesel engine works and how it differs from a gasoline engine.
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