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【多选题】
在一元线性回归模型y=a+bx+ε中，对于模型中的ε，以下描述正确的有：A.
ε是随机误差，它是一个服从均值为0的正态分布的随机变量
B.
拟合回归得到的残差一般为ε的估计
C.
在通过回归得到模型系数后，写出具体回归模型时，一般模型中不用再写ε
D.
ε作为随机误差是客观存在的，在回归建模时，一般无法消除随机误差对模型精度的影响
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