The materials from examinations were analysed and compared . The author suggested that changes of T vector ring and ST vector could be acted as a non invasive simple and sensitive method to diagnose CHD early .

对检查资料比较分析后，作者提出，心电 向量T 环改变及ST向量可以作为冠心病早期诊断的一种简捷、敏感的无创检查方法。

According to the vector potential of a current-carrying ring and the superposition theorem of the field the series solutions for the magnetic fields of a solenoid wired with thin wire are obtained in this paper .

利用圆电流 矢势和磁场的叠加原理，导出了细导线密绕 螺线管磁场的级数表达式。

Some Characteristics of a Left Vector Space Over Divison Ring

除 环上左 向量空间的若干性质