旋标装置飞机控制板上的指示器或观测仪，用来测量角度。
An indicator or a sighting apparatus on a plane table, used in angular measurement.
目的：观测椎板下棘的形态特点，探讨其在显微内窥镜腰椎间盘切除术(MED)中的临床意义。
Objective: to observe the anatomical features of spina lamina vertebrae inferior (SLVI) and study its clinical significance in the Microendos copy discectomy (MED).
在实验中用不同厚度玻璃板观测滑行波的变化规律，并观测两层介质中滑行波与两种介质厚度的关系。
The variation law of slide wave is studied with different thickness of glass plates and the relation between slide wave in two layer medium and the thickness of the two media is observed.
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