《国际电报字母表》国际电报字母
international telegraph alphabet
《陆海军联合无线电话电报规程》
Joint Army and Navy Radiotelegraph and Radiotelephone Procedure
n维电报方程
n dimension telegraph equation
按特惠价目计费的政务电报
government telegram where preferential rate is to be charged
按信件收费的政务电报
government letter-rate telegram
半线性电报方程
Semilinear telegraph equation
保密电报设备
secure telegraph equipment