单项选择题In 1929, Qian Zhongshu was admitted to Tsinghua University because of his excellent performance in Math, Chinese and English languages. A.对B.错
多项选择题厌氧生物处理的主要特征有() A、A能耗低,且还可回收生物能(沼气) B、B负荷高,占地省 C、C设备启动和处理时间长 D、D对氨氮的去除效果不好