题目内容

A．approvedB．admiredC．deridedD．scolded

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

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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

A．toppedB．coveredC．overdoneD．surpassed

A. topped
B. covered
C. overdone
D. surpassed

A．attemptingB．dealingC．tacklingD．talking

A. attempting
B. dealing
C. tackling
D. talking