For the generation of biogas, the materials commonly used are__________?A. Animal wastesB. Forest residuesC. Aquatic plantsD. None of these 0 0 votesArticle Rating Subscribe LoginNotify of new follow-up commentsnew replies to my comments Label {} [+] Name* Email* Website Label {} [+] Name* Email* Website 0 Comments Oldest Newest Most Voted Inline FeedbacksView all comments
