Silicicacid is one of the impurities of naturalwater which is common and difficult to remove、This paper introduces the coagulation test study on removing of turbidity and reducing silicon of raw water and the balance function among four coagulants was obtained.

Through the application of the orthogonal design and regression analysis in the concrete mix proportion experiment, firstly, we can get:the prominence of regression analysis in exactly judging the independent variable; secondly, through the regression equation the relationship between the independent variable and dependent va.

Comparative Test on New Late Rice Variety in Huichang County in 2006;

A comparative test of the rectangular V-type curved otter board and V-type curved otter at sea;

In accordance with the problems of waste water discharge and lack of clean water,a comparative test is conducted in Shengtuo Oilfield to produce polymer using waste water.

The contrast test and management strategy for glucose monitoring meters;

Before use,contrast test and bias evaluation ought to be carried out so as to determine whether the results of other instruments were in the allowable range compared with the reference method,and to calibrate into uniformity.

Then,the basic reasons of causing system errors are found out by the experiment contrast.