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【单选题】
颗粒污染物中,粒径在10μm以下的称为( )。A.
TSP
B.
飘尘
C.
降尘
D.
烟尘
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举一反三
【单选题】The Wonderful World of Small There's a quiet revolution going on, and its name is nanotechnology. A host of innovations are coming our way. Some seem almost magical, like the new material created in 2...
A.
Y
B.
N
C.
NG
【单选题】听力原文： What are zebra stripes on the tomato soup cans and potato chip bags? They are special black and white vertical lines. These black and white stripes can be read by an optical scanner, or computer...
A.
the checkout clerk
B.
the customers themselves.
C.
a laser beam of light.
D.
the cash register.
【简答题】国际件到对方海关会清关延误或扣关,主要有什么原因?
【单选题】The Wonderful World of Small There's a quiet revolution going on, and its name is nanotechnology. A host of innovations are coming our way. Some seem almost magical, like the new material created in 2...
A.
Y
B.
N
C.
NG
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