1.
Like the searchlight beam, the radio beam cannot be made very sharp; it tends to spread.
无线电射束也象探照灯的光束一样，是不能高度集中的；它总要散开。
2.
twin-cathode ray beam
双电子束，双阴极射线束
3.
radio (directional) beam
无线电(定向)波束
4.
Cathode-ray tube(CRT)
电子束管(阴极射线管)
5.
radio landing beam
无线电着陆导航波束
6.
radio trunking technology
集束无线电通信技术
7.
revolving beam station
旋转波束无线电信标台
8.
radio frequency emission testing
无线电频率放射测试
9.
radio fan marker
无线电扇形辐射指点标
10.
radio-wave refractive index of air
无线电波的空气折射率
11.
marine beacon transmitter
船舶导航无线电发射机
12.
aircraft radio transmitter
飞机用无线电发射机
13.
frequency tolerance of radio transmitter
无线电发射机频率容限
14.
radio receiver or transmitter
无线电接收机或发射机.
15.
beacon transmitter
无线电指向标发射机
16.
a radio receiver, transmitter
无线电接收机、 发射机.
17.
variable radio-frequency radiosonde
变射频无线电探空仪
18.
a group of nearly parallel lines of electromagnetic radiation.
一束几乎平行的电磁射线。