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- 3在NaOH溶液中通入少量的CO2时,发生反应CO2 + 2NaOH == Na2CO3 + H2O
- 4用2分之1吨小麦可以磨出8分之3吨面粉,求磨出1吨面粉需多少吨小麦?,列式为?
- 5用成语概括句子的情感或意思,凭着双臂舒展和双腿弹跳,似乎想去哪里就能飞到哪里
- 6祖冲之在圆周率方面的贡献是什么?
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- 8we all took an________part in the sports meeting last week
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