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【多选题】
标准蹲姿的正确表述是( )。A.
在拾取低处的物件时，应保持大方、端庄的蹲姿
B.
一脚在前，一脚在后，两腿向下蹲
C.
前脚全着地，小腿基本垂直于地面.后脚跟提起。脚掌着地.臀部向下
D.
身体协调，姿势稳健，挺胸抬头，目视前方
E.
不前靠，不左摇右晃
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