... 壳壁 housing wall 壳壁破裂 housing wall rupture 探针外壳 housing， probe ...
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The shortcoming of top valve housing for standard type oil well pump plunger is wear and rupture of oil flow pore wall.
标准型抽油泵柱塞上阀罩的工作缺陷是出油孔壁磨损断裂。
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