Parallel gate valveparallel slide的意思|示意
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平行闸阀平行滑动
Parallel gate valveparallel slide的网络常见释义
平行式闸阀 ... 02 平行式闸阀 Parallel gate valveparallel slide 04 升降杆式闸阀 Outside screw stem rising through 05 旋转杆式闸阀 Inside screw nonrising stem type ...