理论上4千股票和5百股票相比，应该是4千股票风险小回报低？可现在这情况是7大公司赚大钱，493家公司赚小钱或者不赚钱。

来源: hhtt 于 2026-02-01 18:03:49 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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