differential absorption method
differential absorption method
微分吸收法
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Based on the infrared spectrum absorption characterization of methane gas, the long optical distance differential absorption method for methane detection is studied.
基于甲烷气体的红外光谱吸收特性，研究了长光程差分吸收式甲烷气体检测的方法。
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