目前通常应用于污水处理领域的模式是（）模式。
A．BOT
B．风险型CM
C．DB
D．DBO
参考答案：D
The old man is my grandfather.
A．eighty-years-old; like
B．eighty-year-old; likes
C．eighty-year-old; like
D．eighty years old; likes
刘 * * * * 曾经在哪一个部队担任政委？
