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【多选题】
关于振动沉桩论述，正确的是（）
A.
必须考虑振动对周边环境的影响
B.
沉桩机和桩的中b可以不在同轴线上
C.
开始沉桩时必须立即开动振动，防止桩位偏移
D.
吊桩的起重机吊钩上必须由防松脱的保护装置
E.
振动沉桩机、机座、桩帽应连接牢固
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