Pretreatment

Several methods to preprocess the sample for determination of phenol in sewage are reported and compared.

本文主要简述了在测定污水中苯酚时对污水试样的一些预先处理方法。

The effect of preemptive Han s acupoint nerve stimulator on postoperative pain in patients undergoing radical mastectomy;

预先韩氏穴位神经刺激对乳腺癌术后镇痛效果的影响

The obtained activation energies for the first crystallization is 299±10kJ/mol,with the crystallization kinetics proceeding by a three-dimensional diffusion controlled grain growth on pre-existing nuclei,where n=1.

3,是以预先形核的核心为基础的三维扩散控制生长方式为主;第二个晶化过程为残余非晶中Fe3B的形成过程,其激活能为423±12kJ/mol,Avrami指数为3。