盈利大起大落。

盈利衰退。

盈利大起大落、盈利衰退的品种，投资难度太高，并不适合作为普通投资者的投资主力。

所以我们主要针对的就是前3类品种。

最容易分析的是第1类，也就是盈利保持不变的品种。

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