代号

What's the code for Tianjin?

天津的代号是多少?

Hand wheel,lever and spanner driving and safety valve,pressure reducing valve,traps overleap this symbol.

1、手轮、手柄和扳手传动以及安全、减压、省略本代号。

The content of basic standard has: Method of code name of substantival term, symbol, mark, standard weaves the method.

基础准的内有：名词术语、符号代号、记法、准编排法等。