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【单选题】
盐酸与 MnO2 反应的化学方程式:
A.
14 HCl( 浓） +  MnO2  =  Cl2 ↑ +  MnCl2  +  2 H2O
B.
14 HCl  +  MnO2  =  Cl2 ↑ +  MnCl2  +  2 H2O
C.
14 HCl(稀） +  MnO2  =  Cl2 ↑ +  MnCl2  +  2 H2O
D.
14 HCl  +  MnO2  =  MnCl2  +  2 H2O
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B.
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animal viruses recombining with human viruses
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two animal viruses recombining in one animal
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two animal viruses recombining in a human
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【单选题】It can be inferred from the passage that all of the following are ways of producing new strains of influenza viruses EXCEPT______.
A.
two influenza viruses in the same animal recombining
B.
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C.
two animal viruses recombining in one animal
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to protect consumers and enable them make informed choices
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to make the distinctive signs remain distinctive forever
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A.
The soil samples from the forest contain about the same amount of silt as the soil samples from the grassy field.
B.
The soil samples from the forest contain a smaller amount of clay than the soil samples from the grassy field.
C.
The soil samples from the forest contain a smaller amount of sand than the soil samples from the grassy field.
D.
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