我如何能告诉如果一个列表的3个或更多的线段，形成一个封闭的区域(3d) ？
How can I tell if a list of 3 or more line segments form a closed region (in 3d)?
对于全封闭煤层气藏，所有压力和压力导数曲线是斜率为1的直线段。
As for a closed coal-bed gas reservoir, all the curves of pressure and pressure derivative are straight line with the slope equal to 1.
对于全封闭煤层气藏，所有压力和压力导数曲线是斜率为1的直线段。
As for a closed coal-bed gas reservoir, all the curves of pressure and pressure derivative are straight line with the slope equal to 1.
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