多选题:每个人的工作最佳时间不同,主要存在三种变化模式( )。

题目内容:
每个人的工作最佳时间不同,主要存在三种变化模式( )。 A.先高后低
B.先低后高
C.中间低两头高
D.中间高两头低
E.白天高晚上低
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