問題詳情
49. What substance did Brown and Hazen analyze?
(A) Dirt
(B) Streptomycin
(C) Bacteria
(A) Dirt
(B) Streptomycin
(C) Bacteria
參考答案
答案：A
難度：適中0.416667
統計：A(15),B(11),C(8),D(1),E(0)
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