搜索结果: 1-1 共查到“理学 Developing Nations”相关记录1条 . 查询时间(0.066 秒)
Local materials, low cost and good science add up to technology for developing nations
irrigation system cholera bacteria
2007/5/15
May 14, 2007，"Appropriate technology" for developing nations can be as simple as a cloth sari folded four times and used to filter cholera bacteria from water. It can be as elegant as a clay pot withi...