1)alphabetical signal,字母信号2)single letter signal,单字母信号3)three letter signal,三字母信号4)two letter signal,双字母信号5)caption signal generator,字母信号发生器6)alpha system,字母信号系统7)letter,字母8)letters,字母9)Alphabet,字母10)christcross-row,字母
用法和例句
Normal use of letters except physical quantities and units in chemical manuscripts;
化学稿件中非量和单位字母的规范用法
A letter recognition system based on neural network is developed by using Matlab 6.
5和VisualC,设计一个字母识别系统。
While in a linear writing of English letters,it is not the forms but the sound that expresses the meaning.