方程式PbS+4H2O2=PbSO4+4H2O
第一个关卡中PbS只有一个键
第二个关卡中增大难度PbS有三个键
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AgAA
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SwIAAA==
第一个关卡中PbS只有一个键
第二个关卡中增大难度PbS有三个键
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AgAA
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SwIAAA==