They received a number of _____ from customers about the lack of parking facilities.

A．complains

B．complaints

C．complainer

D．complainers

肺总量减少最少见于（）

A.肺水肿

B.张力性气胸

C.大量胸腔积液

D.阻塞性肺不张

E.阻塞性肺气肿