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。
BA series pump sealed the shaft with stuffing, CB series pump sealed the shaft with mechanical seal, the two series pumps have the same parameters, contour and installation size.
BA泵的轴封采用软填料密封，CB泵的轴封采用机械密封，两形式的性能参数、外形及安装尺寸完全相同。
BA series pump sealed the shaft with stuffing, CB series pump sealed the shaft with mechanical seal, the two series pumps have the same parameters, contour and installation size.
BA泵的轴封采用软填料密封，CB泵的轴封采用机械密封，两形式的性能参数、外形及安装尺寸完全相同。
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