A.电视机的后盖有许多孔
B.电脑机箱内有小风扇
C.电动机外壳有许多散热片
D.家电长时间停用,隔一段时间应通电一次
答案:D
In the job interviews applicants often find themselves ______ unexpected questions, some very difficult to answer.
A.asked
B.asking
C.to be asked
D.to ask
军团菌病有哪两种类型各有何主要特点