rotating valve 中文意思是什麼
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Experimental research on a hydraulic exciter with rotating valve control
一種旋轉閥控液壓激振器的實驗研究 -
Non - rotating stem with precision acme threads and burnished finish. valve suitable for horizontal installation
不旋轉閥桿具有精密梯形螺紋和經過拋光的表面光澤度。
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