分析比较不同发射口面分布下的电磁波的传播规律，得出满足聚焦条件的一种口面分布。
The optimum distribution, which could let the EM wave focus inside the Fresnel zone, is given as well.
一旦空中拍摄开始，P - 51飞行员端起50口径的机关枪，向佩斯b - 17发射空弹，卡梅隆则立刻跳入P - 51飞行员身后。
Cameron jumped in behind the pilot of the P-51 and once airborne started filming while the pilot fired. 50-caliber machine gun blanks at Pace's B-17.
最后讲解了声发射源定位的原理和通过多路开关、计算机并行口构建多通道源定位系统的硬件结构。
At last it discusses the principle of AE source location and constructs the hardware structure of locating via multi-passages switch and parallel port of computer.
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