This paper describes the metallurgical theory for Ba and the productive practice of Si-Ba series ferroalloys as well as its application to the ferrous metallurgy.
本文阐述了钡的冶金理论，硅钡系列铁合金的生产实践，以及在黑色冶金中的应用。
Methods:A series of 49 patients with cervical spondylosis were firstly used routine TCD to test their BA and VA, and then neck-turning test were used.
方法：对49例颈椎病患者基底动脉（BA）、双椎动脉（VA）先行常规TCD检测后加做转颈试验，观察其血流速度等血流动力学变化。
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