为了解气候舱周边空气质量对检测结果的影响，本文应用数学分析方法对气候舱内空气中甲醛本底浓度的变化规律进行了探析。
To investigate the impact of chamber ambient air quality on the testing results, mathematical analysis is performed to study the vibration trends of formaldehyde background concentration.
那些试飞飞机并未遇到整片天空火山灰浓度高于每立方米400毫克，即本底水准20倍的区域。
Those flights have encountered no patches of sky with an ash density of more than 400 micrograms per cubic metre, 20 times the background level.
应用此模型研究了萃取时间、水样中氯仿的本底质量浓度和高效有机吸附膜厚度等对萃取效率的影响。
By this model, the effects of adsorption time, concentration of chloroform in drinking water and film thickness on the adsorption efficiency were discussed.
结果表明，各核素均未对长江造成污染，长江水系放射性浓度仍在本底水平。
The results showed that the radioactivity levels of each nuclide in Yangtze River water system were still lower than that of background, and did not cause contamination.
结果表明，各核素均未对长江造成污染，长江水系放射性浓度仍在本底水平。
The results showed that the raioac-tivity levels of each nuclide in Yangtze River water system were still lower than that of background, and did not cause contamination.
结果表明，随着污染负荷和补水本底污染物浓度的增加，环境需水量分别成近似线性和指数函数增加；
Results showed that, the environmental water demand almost linearly increased with the pollution loading, and exponentially increased with the pollutant concentration of the supplemental water.
除了统计浓度值的算术平均值外，还应统计出主要风向下的浓度值，为大气预测提供本底数据。
Then besides counting up, it should count up the loading values of cardinal wind as the background data for atmospheric forcast.
调查结果表明，上海市各类水体中天然放射性核素浓度属正常本底水平。
The results show that the radioactivity level of varied water bod-ies of the city was within normal natural background.
调查结果表明，宁夏回族自治区水体中天然放射性核素浓度属正常本底水平。
The results show that the radioactivity level of varied water bodies of the region was within normal natural background.
调查结果表明，宁夏回族自治区水体中天然放射性核素浓度属正常本底水平。
The results show that the radioactivity level of varied water bodies of the region was within normal natural background.
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