UASB反应器的基本特征是在反应器的上部设置气、液、固三相分离器,下部为污泥悬浮层区和污泥床区,使污泥床区保持()的污泥浓度。
A.较低
B.稳定
C.很高
D.适当
参考答案:C
Stop _______ me to hurry up. I can only go so fast.
A.to tell
B.telling
C.to have told
D.having told
I’ve got all her records but I've never seen her _________. [ ]
A. in person
B. on her own
C. in the flesh
D. by nature