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(1)表达量值时,在公式、图、表和文字叙述中,一律使用单位的国际符号。(2)阿拉伯数字后面的量化单位凡是有国际符号的一律用国际符号。(3)单位符号中不得加任何额外标记,如缩写点、复数形式、下角标或在组合单位中插入化学元素符号、某物质的缩写符号等说明性记号,可在行文中对单位的表示加以说明。如每升水的含氟量是0.28mg,不能写0.28mgF/L。(4)在用斜线表示相除时,斜线不得多于1条,若分母中包含2个以上单位符号,则整个分母应加圆括号。如 mol/(mg·
(1) When expressing the value, the unit’s international symbols are used uniformly in the formulas, figures, tables, and narratives. (2) The quantitative units behind the Arabic numerals are all international symbols with international symbols. (3) The unit symbol shall not include any additional markings, such as abbreviated points, plurals, superscripts, or explanatory symbols such as the insertion of chemical element symbols or the abbreviation of a substance in the unit of assembly, which may be applied in the context of the expression of the unit Description. If the amount of fluorine per liter of water is 0.28mg, can not write 0.28mgF / L. (4) When the division is indicated by diagonal lines, there should not be more than one slash. If the denominator contains more than two unit symbols, the whole denominator should be in parentheses. Such as mol / (mg ·