1.
" Graphical symbols for diagrams Part 2 Symbol elements, qualifying symbols and other symbols having general application"
GB/T4728.2-1998电气简图用图形符号第2部分符号要素、限定符号和其它常用符号
2.
A string of characters enclosed in separators such as quotation marks or brackets.
用分隔符括起来的字符串。常用的分隔符为引号或括号。
3.
catalytic constant
催化常数[符号Kcat]
4.
any notation that uses 2 characters (usually 0 and 1).
任何符号都使用两个字符（通常是0和1）。
5.
Navigation terms and symbols in common use
GB/T4099-1983航海常用名词、术语及其代(符)号
6.
The symbols used to distinguish between different materials in sections as shown in following table.
剖面符号与机件的材料有关，下表是国标规定常用材料的剖面符号。
7.
any notation that uses 10 different characters (usually the digits 0 to 9).
任何符号都使用十个不同的字符（通常是数字0到9）。
8.
subscript is a large unsigned value, did you intend a negative constant?
下标是大的无符号值，是有意用负常数的吗？
9.
Usually no distinction in notation is made, and both would be represented by the same symbol.
通常标记上不加区别，两者都用相同的符号表示。
10.
The most often used units of specific activity(abbreviated Sp. Act. ) are curies/mole.
最常用的比活性（符号是Sp．Act）单位是居里／克分子。
11.
On the Expressions of Mathematic Formulas and Signs in Special English;
专业英语中数学公式与符号的常用表达
12.
Apply MATLAB Symbol Toolbox to Solve Ordinary Differential Equations by Program;
用MATLAB符号工具箱编程求常微分方程的通解
13.
The Design and Development of Graphic Signs Data Applied in Chemical Instrument Engineering;
化工仪表专业常用图形符号库的设计与开发
14.
A symbol, such as a plus sign, that represents an operation.
运算符号用来进行运算的符号，如加号
15.
Graphical symbols for use on equipment--Common symbols
GB/T16273.1-1996设备用图形符号通用符号
16.
Graphical symbols for use on equipment--Common symbols for machine tools
GB/T16273.2-1996设备用图形符号机床通用符号
17.
the conventional characters of the alphabet used to represent speech.
语言符号系统的常规字符。
18.
Pertaining to a character set that contains letters, digits, and usually other characters, such as punctuation marks.
用于修饰或说明含有字母、数字、通常还有其它字符(如标点符号)的字符集。