Radial horizontal well is the most complicated one in horizontal well series, it has a major horizontal section and one or several branch sections.
辐向水平井是水平井系列中的高难度井，它除了有一段水平井段外，还有另外一条或多条分支井段。
Applying the radial section scanning method based on gray centroid, the image edges are tested with a sub-pixel precision.
采用基于灰度质心法的径向截面扫描法对图像边缘进行亚像素级检测；
The critical safety thickness of hidden cavity increases with the augment of hidden cavity section size, radial constringency, safety coefficient and surface loading.
暗穴临界安全厚度随着暗穴断面尺寸、暗穴半径收敛值、安全系数、地面荷载等参数的增大而增大。
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