closed center valve 中间位置封闭的阀 ; 闭中心阀 ; 闭中央阀 ; 闭核心阀
Closed center rest [机] 闭式中心架
closed center position 中位关闭位置
Closed-Center 中位关闭
closed center system 中位关闭系统
closed center pilot valve 中位关闭先导阀
closed-center tread 中闭胎纹
closed center hydraulic system 中位关闭液压系统 ; 带储能器的液压系统
closed center directional stem 中位关闭方向阀芯
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