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目前,油田上使用的光杆密封器具有局限性,且调偏范围小,因此,我们有必要研制一种新型光杆密封器。
At present, the polished rod sealers used on the oilfield have limitations and the range of adjusting the bias is small. Therefore, it is necessary to develop a new type of polished rod sealers.