nobody knows the REASON.

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送交者: yongshi 于 2009-03-11, 15:49:19:

回答: does that matter? that's the reason u couldn't get 50-50 由 whatistrue 于 2009-03-11, 15:00:12:

but chemists can make one more than 50%,
best case more than 99% in special medium
(such as catalyst or solvent).
thus

MEDIUM is important



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