Biofilms grown inside two sewage collecting pipes located in industrial and residential areas are studied. Bacterial biomass inside three layers of biofilms was
【摘 要】体适能锻炼是提升学生综合运动能力的方式,需要体育教育工作者不断开发出创新“快乐体育”模式,充分调动学生主观能动性,让学生在融洽、和谐、良性竞争的环境中体验体适能锻炼带来的乐趣。 【关键词】快乐体育;体适能;教学模式选择 中图分类号:G633.96 文献标识码:A 文章编号:0493-2099(2021)11-0013-02 Research on the Effect of "Ha
Based on a 2-D hydrodynamic model,a vertically integrated eutrophication model was developed.The physical sub-model can be used for calculation of water density