A criterion of zero magnetic field point, which is related with the symmetry of current-carrying system, is derived from a simple problem.

从一个简单问题出发，引出关于磁场零值点的一个判据，该判据与载流系统的几何对称性有关。

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Based on the acoustic radiation mode analysis, the transfer matrix relating the pressure at every field point to normal component of surface velocity is formed.

基于声辐射模态分析，建立了外部场压和结构表面振动速度之间关系的传递矩阵。

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When the direct boundary element method (DBEM) is used to solve an elastic problem and the field point coincides with the load point, the boundary integral will be strange.

在用直接边界元法解决弹性问题时，当场点与加载点重合时，边界积分方程将出现奇异。

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Despite the lack of support for the American team on the field, the U.S.players were quick to point out that the Nigerians had been very friendly to them,as well.

VOA: standard.2009.11.05

Share real information that will help people in your field, point the way to what they need, whether you are the source or someone else is.

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The Tax Policy Center is not out in left field on this point.

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