The observation of longitudinal horizontal displacement of an earth dam is to observe the relative strain of the length between two displacement points.
土坝纵向水平位移观测是观测两两位移点间长度的应变值。
The longitudinal and horizontal displacement formula of image formation by parallel glass panel are obtained with the step-by-step image formation method.
基于逐次成像法，得到了物体经平行玻璃板所成像的纵向及横向位移的严格表达式。
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