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【单选题】
细颗粒物是指悬浮在空气中,空气动力学当量直径小于等于( )μm的颗粒物。A.
1.0
B.
2.5
C.
10
D.
100
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举一反三
【单选题】12 7. In this museum a guided tour _____ for you at no charge.
A.
being provided
B.
to provide
C.
is provided
D.
provides
【简答题】出境货物最迟应在出口报关或装运前15天报检，个别检验周期较长的货物应留有相应时间。( )
【单选题】Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45. Cyber crime which is the illegal activity committed on the Internet is the fast...
A.
the unlawful activities committed by the Internet
B.
the illegal activities done by telephoning
C.
the unlawful activities done by getting others' digital records
D.
the illegal activities committed by others' computers
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