What is this passage mainly about?
A.Disadvantage of face recognition technology.
B.Purposes of face recognition technology.
C.Controversial face recognition technology.
D.Effect of face recognition technology.
第8题
A.含水硫酸钙(CaS04•2H20)
B.硫化砷(As2S2)
C.三氧化二砷(As203)
D.二硫化铁(FeS2)
E.硫化汞(HgS)
自然铜的主成分是
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