For a low speed blow down wind tunnel with semi-open test section, the effectiveness of main flow damper in rapidly changing test velocity is verified through experimental research.
通过实验研究证明了用主流阻尼器快速调节半开口直流式低速风洞的实验风速的可行性。
2
Based on model comparison between the semi-infinite earth and the circular tunnel with peripheral infinite earth, the conception of long and large tunnel in the electrical meaning is put forward.
在比较半无限平面大地模型和四周无限大地圆形隧道模型基础上，提出电气上的长大隧道概念。
3
That was the magnitude of the challenge facing Arsenal as they emerged from the tunnel of Juve's formidable stadium for the second leg of the 1980 European Cup Winners' Cup Semi-Final.