The influence of the size of sound lens and the sound velocity in sound lens material and crude oil and rock stratum on the sphereofaction 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。
2
Compared the literature of Hunan in the Tang Dynasty with before, the quantity of native writers and from other parts increase and the sphereofaction is expanded.