与津液排泄障碍最不相关的脏腑是（）
A.脾胃
B.肺大肠
C.肺三焦
D.大肠肾
E.膀胱肾
参考答案：A
The famous scientist was going out _____ he found himself surrounded by lots of young people.
A．when
B．before
C．while
D．after
污水中的氮只是来自工业废水。
