It is used to solve the rod string optimal design issue of the rod pump system.
确定下泵深度与抽油杆柱组合是抽油机井生产参数设计的重要内容.
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Wind - induced vibration has been a key design issue of long span cable - stayed and suspension bridges.
目前, 斜拉桥 和悬索桥的主要技术难点依然是抗风设计问题.
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