讨论黑体燕尾腔的设计原理,写出它的黑体模拟数学式,给出适用腔体的几何参数。
For the first 3-6 months, you really shouldn worry about turning or doing maneuvers, so whether your board is a swallow tail or a pintail or even if it only has one fin is really pointless.开始的3 - 6个月里,你不用过于担心转弯和制动,因此不管你的板子是燕型板尾,鸭尾型或者只有一个尾鳍这都不是要点。
Here you can see the rounded saddle-back style houses typical of regional working and farming classes and, in the background, the pointed, swallow tail roofs that were once the reserve of the gentry.在那里你会看到圆形的想马鞍形状的房子,区域工作和农业阶层的建筑代表。在屋子的后面,尖尖的燕尾状的屋檐让人想起了绅士的装扮。