Article
衣類污點拔除法(續) - Methods to get rid of stains on clothing (continued)
Subject matters: 新知 - new knowledge,
Language level: Wenyan
Article
中國秤之分度法 - The scale of Chinese weigh-beam
Subject matters: 新知 - new knowledge,
Language level: Wenyan
Persons:
陳步歐 Chen Bu'ou (Author)