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【单选题】
电解质 B 的水溶液,设 B 电离后产生 ν + 个正离子和 ν - 个负离子,且 ν = ν + + ν - ,下 列各式中,不能成立的是:
A.
a ± = a B
B.
a ± = a B 1/ ν
C.
a ± = γ ± ( m ± / m )
D.
a ± = ( a + ν + · a - ν - ) 1/ ν
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