Hypersonic wind tunnels operating at very low densities were developed starting in about 1960.低密度超音速风洞大约开始发展于1960年.It would reach hypersonic speeds -- five times the speed of sound.也就是说,要使飞机达到特超音速—即音速的五倍.FEM FCT is used ...
The forebody design a key issue for hypersonic airbreathing vehicle.前体设计是吸气式高超声速飞行器设计的关键之一.It would reach hypersonic speeds -- five times the speed of sound.也就是说,要使飞机达到特超音速—即音速的五倍.hypersonic aerodynamics高超音速空气动力学rarefied...
丝锥 、 铰刀 、 钻头 、 锯片 、 铣切刀具 、 磨光工具以及其它等等, 所有这些方面的片镀都是很成功的.Taps, reamers, drills, saws, milling cutters, burnishing tools, and so on, have all been successfully plated.可以看到德国人在丛林之间悠闲地用大镐和铁铣构筑防御工事.German figures could be seen...
...a surfing competition...冲浪比赛I'm going to be surfing bigger waves when I get to Australia!到了澳大利亚后我要去浪头更大的地方冲浪！We plan to climb mountains, go fishing, swimming and surfing.我们打算去爬山 、 钓鱼 、 游泳还要去冲浪.Hawaii was the birt...
The Foreign Office in London has expressed surprise at these allegations.位于伦敦的英国外交部对这些说法表示惊讶.Martinez expressed confidence of victory at the ballot box.马丁内斯表示了对选举获胜的信心。She expressed resentment at being interviewed by a s...