The frequencies of the returned beams are compared with them to obtain the true ground speed . 将它们与反回射束作对比而获得真实的地面速度。
2.
How can i make my program not echo input 我怎样使我的程序不回射输入？
3.
Return loss outnput 输出回射损失
4.
Return loss input 输入回射损失
5.
Standard specification for minimum retroreflectance of newly applied pavement marking using portable hand - operated instruments 使用便携式手操作装置对新应用人行道标记的最小回射测定的标准规范
