1. Acoustic intensity measurement system based on two-microphone acoustic intensity probe. Acoustic intensity can be calculated by acoustic pressure signal measured by two-microphone. 声强测量大多基于双传声器声强探头系统，通过两个传声器测得的声压信号间接求出声强。
2. Acoustics, The geometric space figure that is made up of the acoustic foci of an acoustic lens, mirror, or other acoustic optical system and is the acoustic counterpart of an extended source of sound. 声像原指声音经过音响及环境绕折射组成一个声透镜新的聚焦点，形成的几何空间形象。
3. You can make Mercator projection map, Corn projection map, orthographic projection maps. 您可以麦卡托投影地图，玉米投影图，正投影图。
4. They are commonly used in map projections, polar projection, Mercator's projection Lambert conformal conic projection are three of them. 导出在极射赤面投影、卡托圆柱投影和兰勃脱正形圆锥投影等算法中确定位置坐标的精确公式。
5. They are commonly used in map projections, polar projection, Mercator's projection Lambert conformal conic projection are three of them. 导出在极射赤面投影、卡托圆柱投影和兰勃脱正形圆锥投影等算法中确定位置坐标的精确公式。
