ICS01.100.20 J O 卩华人民共和国家标准 GBT4457.42002 代替GB/T4457.4-1984 机械制图图样画法图线 Mechanical drawings General principles of presentation Lines (ISO 128-24: 1999, Technical drawings-General principles of presentation Part 24: Lines on mechanical engineering drawing, MOD) 20020906发布 20030401实施 中华人民共和国 家质量监督检验检疫总局 发布