... 双螺旋输砂器 double spiral sand conveyor 双面阀 double-face valve 双膜理论 two-film theory ...
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... cylinder slide valve face 气缸滑阀面 double face valve 双面阀 double-face sluice valve 双面闸阀 ...
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短语
双面滑阀
double -faced box slide valve
双面闸阀
double-face sluice valve
单阀碟双面平行密封
parallel single disk gate valve
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