... direct fermentation直接发酵 direct sampling system直接取样法 direct steam直接蒸汽 ...
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The propagation at low altitudes and the ADC noise in the RF direct sampling system taken are considered, and the main factors which affect the coverage of low altitude detection is analyzed.
考虑低空传播以及直接采样系统中adc器件的噪声，分析了低空探测时影响观测范围的主要因素。
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