Relative Air Speed (radiotelegraphy)相对气流速度(radiotelegraphy) Quiktrak Networks LimitedQuiktrak网络有限公司 What is the speed of your aircraft in relation to the surface of the earth?什么是你的飞机的速度之间的关系,在地球表面上的? QuickTake digital camera Bitmap graphicsQuickTake数码相机点阵图形