acceptable concentration

Secondly , Acceptable concentration level of mixtures prediction models are established on the basis of quality prediction models by changing the input and output of the quality forecast neural network models .

其次，在质量预测模型的基础上，通过改变质量预测模型的输入输出量建立混油掺混比例的预测模型即混油浓度预测模型。

Combined BaP pollution in cities of China in air with level of death rate of lung cancer , it suggests by complicated analysis that it be appropriate 0.5-0.6 μ g / 100m3 as acceptable concentration of BaP in air .

结合我国城市大气中苯并（a）芘污染情况和肺癌死亡率水平综合分析认为：大气中苯并（a）芘容许浓度以0.5～0.6μg/100m~3为宜。

The maximum acceptable sulfide concentration and volumetric removal rate of simultaneous anaerobic sulfide and nitrate removal process were higher than those of simultaneous anaerobic sulfide and nitrite removal process .

硝酸盐型脱氮除硫工艺所能耐受的最大进水硫化物浓度和硫化物去除速率均优于亚硝酸盐型脱氮除硫工艺。

TCE time-weighed average ( TWA ) concentration of sample air , from 24 dry-cleaning shops taken randomly in Lanzhou , were measured with gas chromatography to estimate exposure levels , analyze risk characterization and calculate acceptable indoor TWA concentration of TCE .

在兰州市随机抽取24家干洗店，现场采样，用气相色谱法测定四氯乙烯的室内空气浓度，计算时间加权平均浓度（TWA），以估算个体暴露量；