The influence of the size of sound lens and the sound velocity in sound lens material and crude oil and rock stratum on the sphere of action is studied.
分析了声透镜尺寸及材料中的声速、原油及岩层中的声速对其传播距离的影响。
Compared the literature of Hunan in the Tang Dynasty with before, the quantity of native writers and from other parts increase and the sphere of action is expanded.
唐代的湖南文学与以前比较，本土作家和流寓的外籍作家增多，作家的活动范围和文学所反映的社会生活层面得到扩展。
A new formula on the action sphere of reel slat is driven out through the graphical analysis of reel slat motion locus in this paper.
本文利用图解法分析了拨禾轮的运动轨迹，并推导出新的拨禾轮作用范围的公式。
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