地面测距设备发射填充脉冲是为机载设备()所需导航台提供信号。 A.从等待到搜索 B. 发布时间:2018-10-19 20:10 │ 来源:www.tikuol.com 题型:单项选择题 问题: 地面测距设备发射填充脉冲是为机载设备()所需导航台提供信号。A.从等待到搜索B.快速搜索C.跟踪D.识别
题型:单项选择题 They______ with each other for two years before they got married.A.had fallen in loveB.got in loveC.had been in loveD.fell in love 查看答案
题型:单项选择题 _____ environmental damage is done, it does take many years for the ecosystem to recover.A. Even if B. While C. Only ifD. Once 查看答案