行政复议机关（）的机构具体办理行政复议事项
A.负责宣传工作
B.负责法制工作
C.负责接待工作
D.负责监察工作
参考答案：B
Which is not right the following sentences? [ ]
A. How long can I keep the book?
B. My uncle joined the army in 1985.
C. I have had a bad cold for a week.
D. He has left America for ten years.
一般的二水湿法磷酸装置，通常萃取P2O5浓度控制在（）之间。
A、45%～52%
B、26%～32%
C、68%～72%
D、40%～50%
