As in the first edition, each chapter contains a presentation of its topic in "lecture-book" format together with objectives, an outline, key formulae, practice exercises, and a test.
如同在初版里，每章以“演讲书”形式以及目标包含它的题目的赠送，一个概要，关键公式，实践练习和一次试验。
You can even make an activity out of it by making a poster summarising the formulae, key points and basic steps and putting it up by your mirror.
你甚至可以把它们用来做为活动内容，即把公式，要点以及基本步骤概括起来制造一张海报，然后把它贴在镜子前面，以便复习。
Based on that, the formulae of lithology factor and time factor of load transmitting were established. By means of these formulae, the problem of load calculation for roof key block can be solved.
提出了载荷传递因子的概念，给出了卸荷拱高度的计算公式和载荷传递因子的计算公式，解决了关键块上的载荷计算问题。
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