The compensated piston assembly reduces the difference in cross-sectional area between the upper and lower surfaces of the piston.
补偿活塞组件降低活塞上下表面之间的截面面积的差异。
The compensated piston assembly reduces the difference in cross-sectional area between the upper and lower surfaces of the piston.
补偿活塞组件降低活塞上下表面之间的截面面积的差异。
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