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【单选题】
颗粒污染物中,粒径在10微米以下的称为A.
TSP
B.
PM10
C.
降尘
D.
烟尘
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举一反三
【简答题】早上起来，推开窗子发现地面全都湿了，你推断昨天夜里一定下雨了。这是思维的（ ）。
【简答题】On my first job, I worked as a sports editor for a small newspaper. I never got a letter from my readers, so I was 16 that there was an envelope on my desk one morning. From that 17 I could see it was...
【单选题】From the drawer Mr. Mach took out a chain, with ______ keys dangling at its end
A.
a group of
B.
a series of
C.
a bunch of
D.
a bag of
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