标准摘要
[中文适用范围]： 优选的数字是几何级数的项值的常规舍入，包括10的整数幂并且具有根据指定表格的比率特殊因子。 指定了基本系列、预期系列、R 80 和派生系列。 [外文原描述]： Preferred numbers are the conventionally rounded of term values of geometrical series, including the integral powers of 10 and having as ratios special factors in accordance with the specified tables. Basic, expectional, R 80 and derived series are designated.
英文名称Preferred numbers — Series of preferred numbers