in this article uses the space coordinates and the spatial vector 「three perpendicular line theorems」 promotes the three-dimensional geometry in to the space analytic geometry in, and proved.
it was found to be just at that part of the cliff which was between the projection at the mouth of the mercy and a perpendicular line traced above the heap of rocks which formed the chimneys.
according to data analysis of actual measure, this paper obtains perpendicular line current velocity coefficient of measuring section and measuring discharge coefficient on the bridge.
经过实测资料的分析,得出了呼玛桥水文站桥测断面的垂线流速系数以及桥测流量系数。
in right viewport, anywhere, create one little perpendicular line from top to down long 0.15cm.