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【多选题】
下列关于浴盆曲线的描述，正确的有( )。A.
早期故障阶段的产品故障主要是设计与制造中的缺陷
B.
偶然故障阶段产品故障率可降至一个较低的水平，且基本处于平稳状态，可以近似认为故障率为常数
C.
耗损故障阶段产品故障率迅速上升，很快出现产品故障大量增加或报废的现象
D.
耗损故障阶段是产品的主要工作期间
E.
规定的允许故障率越高，产品的使用寿命越短
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