Question

英语翻译规定英文字母以及标准符号… 半角・大写日语以及特殊符号… 全角各项目的联接用（逗号）＋（半角空格）

Answer 1

Provisions

English letters and standard symbols ... upper half-width

Japanese full-width, and special symbols ...

The purpose of connection with (comma) + (half space)

Material used abbreviations (see this Long Description)