Each piston disassembled and polished, each nut and washer cleaned or replaced, accounted for.
每个活塞都要拆下来并且打磨，每个螺母和垫圈都要清洗或更换，并且一个都不能少。
The high strength steel (100,000 psi minimum yield) piston rod has a ground, polished, and chrome plated surface.
高强度钢（100，000防扩散的最低收益率）活塞杆有一个理由，打磨，表面镀铬。
A type of pumper that uses a hydraulic power source, a cylinder, and a piston attached to the polished rod.
利用液压动力源、液压缸和固定于光杆的活塞进行抽油的一种抽油机。
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