该刻度盘能显示很微小的压力变化。
然后，增加采样的压力，直到读显示标定刻度气体值。
Then increase the sample pressure until the reading displays span gas value.
刻度盘显示出压力有极微小的变化。
The dial records showed a very slight variation in pressure.
刻度盘显示出压力有极微小的变化。
The dial records showed a very slight variation in pressure.
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