题目内容

A.onB.fromC.aboutD.of

A. on
B. from
C. about
D. of

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A.topicsB.ideasC.argumentsD.themes

A. topics
B. ideas
C. arguments
D. themes

A.approvedB.admiredC.deridedD.scolded

A. approved
B. admired
C. derided
D. scolded

A.evilB.sinC.wickednessD.bad

A. evil
B. sin
C. wickedness
D. bad

大气含尘浓度≥0.5μm的为3×105粒/L,经三级过滤器,≥0.5μm过滤效率分别为18%,55%,99.9%,则过滤后的空气含尘浓度≥0.5μm为()粒/L。

A. 111
B. 137
C. 152
D. 178

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