The oil industry is marked by an element of danger, hence the siting of refineries is at a distance from population centers.
石油工业的特征是有一点危险性，所以炼油厂的厂址在远离人口集中的地方。
Having analyzed many factors, such as distance, Angle, element size, the number of gauss integral, etc., which have great effect on the gauss integral precision.
分析了距离、角度、单元尺寸以及高斯点个数等因素对积分精度的影响，提出了一套满足不同精度要求的积分判据。
The judge methods of offset rationality is deduced at element local coordinate, and ensure that the element plane distance between after offset and before is close to the offset distance.
推导了在单元局部坐标系下判断等距合理性的计算方法，并且保证了等距前后单元所在平面之间的距离尽可能地接近所要等距的距离。
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