... two-stage relay 两级继电器，两阶段继电器 two-stage servo 两级伺服系统，两级随动系统 two-stage sodium exchange 两级钠离子交换 ...
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two-stage electrohydraulic servo valve 两级电液压伺服阀
By adopting a 2d pneumatic digital servo valve composed of servo spiral mechanism, conventional two-stage pneumatic servo valve structure is simplified while its performance is greatly enhanced.
利用一种伺服螺旋机构构成的二级气动数字伺服阀(简称“2d气动数字阀”)，简化了传统二级气动伺服阀的结构而性能却有较大提高。
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