背景气（Background Gas） （1）钻井液池背景气（Ditch Background）指停泵时钻井液池中冷钻井液所含气体 的初始值。一般情况下，它与气体真零值相符。
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低浓度的烷烃背景气体对恶臭的脱除效率基本无影响。
Basically, low concentration of alkane background gas has no effect on the removal efficiency of malodorous gas.
实验结果表明，液体的溅射速度和距离随着背景气压的降低而增加。
The experimental results show that, liquid sputtering velocity and distance increase with the decrease of the ambient pressure.
利用所建模型，分析了不同激光功率密度和背景气压对烧蚀和蒸汽膨胀的影响。
The model has been used to investigate the influence of different laser irradiance and ambient gas pressure on the laser ablation and the expansion of plume.
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