Project agree the light, project pre-stage feasibility analysis, market analysis.

项目洽淡、项目前期可行性分析论证、市场分析。

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The set takes Roots pump as its main pump and spinning vacuum pump as pre-stage pump.

本机组采用罗茨泵作为主泵，以旋片式真空泵作为前级泵。

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In between, an electromagnetic vacuum inflation valve is installed in series, which opens and closes with the switch of the pre-stage pump.

在前级泵与主泵中间串联一个电磁真空充气阀，随前级泵开关而启闭。

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But I don't want to pre-empt in any way, President Karzai's statement, which will set the stage for how we go forward in the next stage of this,".

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