Check piston diameter on oil piston shank with micrometer gauge.

使用千分尺在机油活塞体上检查活塞直径。

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Decreasing the piston diameter of the pump can improve the stability.

减小油泵柱塞直径对稳定性有好处；

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Check the piston diameter on the piston shank using a micrometer gauge.

用千分尺在活塞体上检测活塞直径。

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