在处理污水过程中,于污水中加入30~70mg/L硫酸亚铁,可使污水中残余的()约减少一半。
A、酚
B、氰
C、油
D、污泥
参考答案:B
Do you have any shoes can match the dress?
A. attracts B. attracted C. has attracted
使夭札之民咸登仁寿者。(夭札)(仁寿)