这对于要求大功率光源的漫反射表面速度变化的测量是极为有利的。
This is very useful for THR measurements of velocity changes for porous reflecting surface that require light source with great power.
基于此原因，砂轮的速度不应超过制造商规定的安全表面速度的限制。
For this reason, the speed of a grinding wheel should not exceed the safe surface speed limit specified by the manufacturer.
通过测量表面速度和流层厚度，初步分析了流率及壁面状况对流动的影响。
Surface velocities as well as flow thickness were evaluated by means of tracer particles by which the influence of the flow rate and wall-wear was analyzed in experiment.
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