文章分析了往复式抽油机运行机理，并从中找出了其耗能的原因；
The operation mechanics is analyzed and the cause of energy waste is found.
对这四种技术的运行机理、实现机制和程序结构等作了较为详尽的阐述。
Give detail description of run-theory, improvement-mechanism and program-structure of these technology in this paper.
对这四种技术的运行机理、实现机制和程序结构等作了较为详尽的阐述。
Give detail description of run-theory, improvement-mechanism and program-structure of these technology in this paper.
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