The pump CAD has many difference from that of hydraulics system and cartrige block.
由于液压泵的CAD与插装阀，集成块及液压系统的CAD有很大的差别和不同。
youdao
Develops a CAD system for gear pump design of locomotives.
研制了一个内燃机车用齿轮泵的CAD系统。
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