曝气池混合液中工作的污泥总量为40kg，每天排放的剩余污泥为10kg，问：污泥龄为多少？
参考答案：
40/10=4天
污泥龄为4天。
缩胆囊素引起胰液分泌特点是（）。
A.水少，盐和酶多
B.水多，盐和酶少
C.水少，酶少，盐多
D.水多，盐多，酶少
E.水少，盐少，酶多
We had wanted to finish our task by noon, but it didn't quite _____ as planned. [ ]
A. find out
B. give out
C. hand out
D. work out
