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ITEM: 41-非牛顿流体
1045
ITEM: 42-操控气球
1020
ITEM: 43-检测食物中的淀粉
987
ITEM: 44-简易指南针
1039
ITEM: 45-磁悬浮
1043
ITEM: 46-多出来的纸
1060
ITEM: 47-密度与浮力
1033
ITEM: 48-维C与碘相遇
1088
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