The table tennis three treasure are variety of the combinatorial techniques; the all-round hitting point and inverse direction techniques, which play important role in the competition.
中国乒乓球队制胜因素即“三件宝”是指技术组合的多样化、击球点的全面性以及反方向技术的应用能力，这三个方面对取得比赛的胜利起着关键的作用。
As an example of inverse plumb surveying point IP13BZA in the Three Gorges dam horizontal displacement monitoring net, this paper demonstrates how to calculate it with this method.
以三峡工程水平位移监测全网(基点检验网)倒垂测点IP13BZA为例，给出了相应的计算示例。
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