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【单选题】
已知 25°C 时电极反应 + 8H + + 5e==MnO 2 + 4H 2 O 的 j θ =1.51V 。若此时 c(H + ) 由 1mol· 减小到 10 -4 mol· ,则该电对的电极电势变化值为 ( )A.
上升 0.38V
B.
上升 0.047V
C.
下降 0.38V
D.
下降 0.047V
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举一反三
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more remarkable than that of a crow
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less convincing an instance than that displayed by the crow
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actually not an instance of what the author is discussing
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restricted to the female of this species
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the personalities of athletes produce violent confrontations
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athletes should not have to accept unnecessary physical abuse
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athletes' salaries are already too high
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understanding
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a rebellious spirit
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【单选题】Regarding the situation of psychological problems the author feels ______.
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concerned
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hopeless
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surprised
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upset
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uncertain
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alarmed
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pessimistic
【单选题】Why the author feels shaky?
A.
Because she is cold.
B.
Because the teacher here is so mean.
C.
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