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【多选题】
对沉井下沉的施工要点的叙述中，正确的是( )。A.
沉井下沉时，可使用爆破方法
B.
沉井下沉施工有排水除土和不排水除土两种方法
C.
沉井预制完成并准确就位后，开始抽除垫木
D.
井底下沉至设计标高2.0m以上时，应放慢下沉速度
E.
正常下沉时，脚处向中间均匀对称除土
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