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【多选题】
深层棉花活性炭过滤器A.
通常作为总过滤器
B.
空气进口在下方，空气出口在上方
C.
需要定期灭菌
D.
棉花过滤阻力较大，但活性炭过滤阻力小，因此常与棉花一起使用
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举一反三
【单选题】For a long time, ___economies like Japan and Korea were few and relatively small compared with importing economies like the U.S.
A.
export-led
B.
import-led
C.
information-intensive
D.
technology-intensive
【单选题】ActiveX is a set of specifications and software that allow small programs or software components to(72)．
A.
work together
B.
work alone
C.
simplify
D.
reuse
【单选题】_______ Switzerland is very small, _______ it is the land of watch and it is very rich. [ ]
A.
Though; but
B.
Because; so
C.
Because; /
D.
Though; /
【单选题】Look at the Palace Museum. It is ____________. [ ]
A.
very beautiful and old
B.
very tall
C.
very small
【简答题】每年的( )为全家安全教育日。【高中】
【简答题】The ______ is very small but getting larger.
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