标准摘要
[中文适用范围]： 本文件规定了 ISO 20318-1 中规定的一般书写自动铅笔用黑芯的分类、尺寸、质量和测试方法。 [外文原描述]： This document specifies classification, dimensions, quality and test methods for black leads used for mechanical pencils for general writing, as specified in ISO 20318-1.
英文名称Mechanical pencils and leads for general use — Classification, dimensions, quality and test methods — Part 2: Black leads