preliminary assessment

According to the sedimentation, a preliminary assessment was conducted on the polluted standard of the heavy metals in the deposit of the lake, in use of I geo.

对北京大学未名湖沉积物中主要重金属含量随深度的变化进行回归分析，应用地积累指数法对未名湖沉积物中重金属污染程度做出影响评价。

The only difference in assessing control risk at moderate or low is the difference in our preliminary assessment control procedures are somewhat more or less effective.

评估控制风险是中等还是较低，其唯一的差别是我们初步评估各种控制程序是比较有效还是比较无效。

Take prepared samples to the analyzer room. Make the preliminary assessment about the compound's properties and then select an appropriate PH-value system to analyse them.

将制备好的样品带到分析室，对化合物性质进行初步判断，选择合适的酸碱体系对其进行分析。