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【简答题】
将浓度为 5mol/LNaOH 溶液 100mL,加水稀释至 500mL,则稀释后的溶液浓度为( ) mol/L A. 1 B. 2 C. 3 D. 4
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【简答题】Just before Christmas in 1971, a girl called Juliana was flying over a big forest of America. The plane was flying high in the sky. Suddenly, there was loud noise. Juliana, through, air, herself, fall...
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A.
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B.
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C.
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D.
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