There is going to _____ a meeting this afternoon. [ ]
A. be
B. hold
C. open
D. opened
A
可采用手术治疗的疾病有()
A.鼻窦炎
B.急性鼻炎
C.急性扁桃体炎
D.慢性扁桃体炎
E.慢性咽炎
硝化细菌nitrifyingbacteria