four-vector 四维矢量
frequency four-vector 频率四维矢量 ; 频率四维矢
time-like four-vector 类时四向量
four-vector potential [电磁] 四元矢量势
Lorentz four-vector 洛伦兹四元矢量
Potential Four-Vector 四元矢量势
four-vector of current density 四维电流密度矢量
Charge four-vector 四维电流密度
It also shows that two four vector potential can be combined into one four vector potential in the region being free of magnetic charges.
同时还证明在磁荷为零的区域两个四维矢势可以合并为一个。
The four vector control methods of induction machines are introduced . Their merits and drawbacks are analyzed . And it indicates that they are applied in different occasion.
介绍了四种异步电机矢量控制方法，分析了各种方法的优缺点，指出各种方法的适用场合。
When creating animations it USES four types of layers: vector graphics, bitmap, sound and camera.
它用四种类型的图层来创建动画：矢量、图形、位图以及声音和照相机。
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