fixed and variable displacement
... PARKER泵的类型： Fixed and variable displacement 固定和可变排量 Pressure compensated 压力补偿 ...
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fixed and variable displacement
固定和可变位移
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Through a study in characteristic curve of the engine and hydraulic pump, the matching efficiencies between engine and fixed and hydraulic variable displacement pump were analyzed respectively.
综合发动机和液压泵的特性曲线，分别对发动机与液压变量泵、定量泵进行了匹配效率分析；
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