There are four levels of visual function, according to the International Classification of Diseases -10 (Update and Revision 2006)

根据《国际疾病分类-第十版》（2006年更新和修订），视力的好坏可分为四个档次

youdao

Meanwhile, introduce and explain the situations and ideas of revision and the characteristic of the Fifth Version of the Chinese Library Classification. 4 refs.

同时，对网络环境下《中图法》的修订概况、修订思路以及第五版特点介绍和说明。参考文献4。

youdao

Meanwhile, introduce and explain the situations and ideas of revision and the characteristic of the Fifth Version of the Chinese Library Classification. 4 refs.

同时，对网络环境下《中图法》的修订概况、修订思路以及第五版特点介绍和说明。参考文献4。

youdao