多项选择题

关于空气过滤器的选择，下列表述正确的是________。

A.高效过滤器用于万级以上的洁净室、无菌病房、无菌灌装室、无菌动物房等净化空调
B.中效过滤器对微生物有很高的过滤效率
C.粗效过滤器用于新风过滤
D.中效过滤器用作高效过滤器的前级保护
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It is known to all that a lot of South Korean ____ accepted plastic surgery.A、celebrationsB、celebritiesC、celebrates
A.A、celebrations
B、celebrities
C、celebrates
单项选择题
—Jeff, I'd appreciate it if you could help me with the opening speech I'm giving next week.—___________________________, but I'll have some time between five and six p.m.A、Don’t mention itB、Yes, it’s so quiet as we expectedC、Well, it's pretty busy this morning
A.—___________________________,
B.m.
A、Don’t
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