数学中要求使用科体字母a.变数、变动的附标及函数b.在特殊场合视为常数的参数c.几何图形中表示点、线、面、体的字母d.坐标系符号e.矢量、张量和矩阵符号用黑斜体化学元素与核素的符号 l)化学元素符号均为正体,且首字母大写. z)核素的核子数(质量数)必须标注在元素符号的左上 Mathematics requires the use of the body of the alphabet a. Variables, changes in the attached and functions b. In special occasions as a constant parameter c. Geometry that points, lines, planes, body d. Coordinate system symbols e. Vector , Tensors and matrix symbols in black italics chemical elements and radionuclides symbols l) chemical element symbols are positive and the first letter of the uppercase z) nuclide nuclei (mass number) must be marked on the upper left of the element symbol