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【单选题】
下列数据中有效数字位数为四位的是
A.
0.060
B.
0.0600
C.
pH=10.06
D.
0.6000
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【单选题】实验人员向儿童呈现两只盒子,一只盛有许多柱子,让儿童往另一只盒子放珠子,问儿童如果一直倒下去,两只盒子里的珠子会不会一样多,儿童不能确认。这说明儿童还没有建立起()
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