Hydraulic Door Openeris designed to work together with BS63-B double-stage double-flow single-output hydraulic manual pump.

液压开门器与BS63-B型双级、双流量、单输出专用液压手动泵配合使用。

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The utility model provides a double-stage slide valve vacuum pump, which consists of an air pipe and two slide valve cylinders.

一种双级滑阀真空泵，由气路管道和二级滑阀缸组成。

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Abstract: the vibration increasing of adjustable vane double-stage axial flow fan caused by the rotors mass unbalance for the vane abrasion in long period running is a main malfunction.

摘要：针对动叶可调双级轴流风机长期运行中叶片磨损造成转子质量不平衡，引起风机振动增大的问题。

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He leapt up with his hands extended in double-peace signs and did a backward-shuffle dance to the stage.

WSJ: In South Africa, a Drive to Rein in Cabbies

If they do, we could see the formation of a short-term double bottom that would set the stage for a better rally.

FORBES: The Week Ahead: This Is No Vacation for Investors

But it was the off-stage drama that prompted more than double the average State of the Union audience to tune in.

CNN: AllPolitics