On this background, an optimization method for stroke frequency of submersible reciprocating pump based on submergence depth forecasting was presented.
在这一背景下，提出一种基于沉没度预测的潜油往复泵冲次优化方法。
It applied the method of on-the-spot photograph to comparing the stroke frequency and rhythm of the male and female kayakers who took part in the "World Cup".
采用现场摄影法，比较世界杯赛中男女皮艇运动员的桨频和划桨节奏。
Crack size, hammer stroke frequency and rotary speed influence the drilling string fatigue life involve, in which the crack size and stroke frequency were two major factors.
影响钻柱疲劳寿命的因素包括钻柱裂纹尺寸、空气锤冲击频率、转盘转速等，而空气锤冲击频率与裂纹尺寸是影响钻柱疲劳寿命的两大主要因素。
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