The equation of polished rod motion and the power expression of the new pumping unit are derived and the design parameters for a Model 4 unit are presented.
导出了椭圆齿轮抽油机的悬点运动方程和功率表达式，给出了一种四型机型的设计参数。
She tells the story of her metamorphosis — from a wide-eyed teenager soaking in verse at New York's Bowery Poetry Club to a teacher connecting kids with the power of self-expression through Project V.
她讲了她从一个沉浸在纽约鲍威利诗社里并有双大眼睛的少年转变为一个通过口语诗展示孩子们自我表达能力的V。
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