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。
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