Drilling, it is necessary to advance 1.5 times the diameter of the screw, the screw too tight will cause stress.
有必要事前钻孔，1.5倍于螺钉的直径，而螺钉过紧会引起压力。
Based on the infinitely straight line, this thesis discusses the concepts of curve of second orders center, diameter, advance gradually in the line.
以无穷远直线为基础讨论二阶曲线的中心、直径、渐近线等几个仿射概念，并联系解析几何中的有关性质，深入讨论它们之间的一致性。
Research results:The support measures in advance were proposed in construction scheme for large-diameter advanced tubal curtain in order to control the displacement of stratum.
研究结果：施工方案中提出了大直径超前管幕支护措施，用以控制地层变位。
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