closed center directional stem的意思|示意
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英 / /
闭式中心定向杆
closed center directional stem的网络常见释义
中位关闭方向阀芯 ... 中位关闭位置：closed center position 中位关闭方向阀芯：closed center directional stem 中位关闭阀[O型中位阀]：closed center valve ...