search and rescue frequency 搜救频率
sea rescue frequency 海洋救援频率
search and rescue beacon frequency 搜救信标频率
radio frequency for emergency rescue 求救无线电频率
·2,447,543篇论文数据，部分数据来源于NoteExpress
They will be decreasing in size and frequency, but at this point they're still large enough to be of concern in hampering the rescue efforts."
VOA: standard.2010.01.13
应用推荐
模块上移
模块下移
不移动