When locating the seismic work area, the rectangular vertexes on the computer screen showed only the approximate coordinates from which the accurate figures had to be deduced.
在确定地震工区位置时，用鼠标在计算机屏幕上点出的矩形顶点只是近似值，需要根据这些近似值求出工区矩形顶点的精确值。
Analysis and examples show that using this method to estimate the approximate coordinates, the accuracy is obviously improved comparing with the approximate coordinates provided by GPS.
理论分析和实例表明，该方法确定的运动载体近似坐标与GPS绝对定位提供的近似坐标相比，精度有明显的提高。
Coordinates of a normal probability paper are calculated with a approximate formula of normal distribution integral curve and drawn on screen.
采用正态分布积分曲线的近似公式计算概率格纸的坐标，并在屏幕绘图。
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