摘要
Just a few months ago, M. Barisco Alfonso knew nothing about bio gas. Today, it is an essential part of his job as a technician in the Agricul-tural Directorate of Sao Tome and Principe.
Just a few months ago, M. Barisco Alfonso knew nothing about bio gas. Today, it is an essential part of his job as a technician in the Agricul-tural Directorate of Sao Tome and Principe.
