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【单选题】
儿童开始能够运用守恒概念,是在( )阶段。
A.
感知运动
B.
前运算
C.
具体运算
D.
形式运算
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A.
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B.
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A.
as a whole
B.
on the whole
C.
on one hand
D.
on the other hand
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