Studies were made of variation of pH, P, K, organic matter, and moisture in soil samples from different sites of north Shanxi.
对取自山西省北部不同地点、不同层次的土样的p H值、磷、钾、有机质、水含量的变化进行了研究。
Conclusion: Respiratory variation of SVC systolic forward flow was a sensitive index for evaluating presence and severity of PH in patients with COPD.
结论：SVC收缩期正向血流的呼吸变化性是检测COPD患者肺动脉高压的敏感指标。
This article summarizes the variation and role of VEGF in the mechanism of CHD-PH.
本文就VEGF在先心病ph机制中的变化和作用进行综述。
The variation of this pH range was dependent on the strength of the base, the volume of the conjugated acid cation, and whether this cation can increase the surface charge of the micelles or not, etc.
这一范围的大小（宽窄）受制于碱的强弱、共轭酸阳离子的体积以及共轭酸阳离子是否能增加胶束表面的电荷等几个方面。
The variation of this pH range was dependent on the strength of the base, the volume of the conjugated acid cation, and whether this cation can increase the surface charge of the micelles or not, etc.
这一范围的大小（宽窄）受制于碱的强弱、共轭酸阳离子的体积以及共轭酸阳离子是否能增加胶束表面的电荷等几个方面。
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