Sample gas tubes are flushed with nitrogen.

采气管得用氮气吹扫。

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A gas with the same background as a typical sample gas composition should be used for this procedure.

这一路气与样品气具有同样的背景，使用同样的程序。

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When sampling, the speed of sample gas is similar to the actural pipe gas by controlling the sample gas flow.

取样时通过控制采样流量，使样气流速模拟取样点管道中煤气流速达到等速取样的条件。

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Shaw said a DNA sample was found at the gas station, but he could not tie it to Heeringa's disappearance, WOOD reported.

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"Different constituents in that sample will break down at different temperatures and become gas, " said Vasavada.

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"We have water, " said Bill Boynton of the University of Arizona, lead scientist for the Thermal and Evolved-Gas Analyzer, the ovens that will cook the sample and measure the temperatures needed to vaporize the components.

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