关于振捣器振捣施工技术的说法，正确的有（）。
A.插入式振捣器振捣普通混凝土时，应快拔慢插
B.插入式振捣器移动间距不宜大于振捣器作用半径的2.0倍
C.插入式振捣器与模板的距离不应大于其作用半径的0.5倍
D.插入式振捣器插入下层混凝土内的深度应不小于50mm
E.采用表面平板振动器时，其移动间距应保证捣动器的平板能覆盖已振实部分的边缘
参考答案：C, D, E
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