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本文提供了膨胀法真空标准装置中传递阀控制单元的一种设计。它能自动控制传递阀进行气体取样和膨胀过程，并同时记录膨胀次数。
This article provides a design for a transfer valve control unit in an expansive vacuum standard unit. It automatically controls the delivery valve for gas sampling and expansion, and also records the number of expansion.