世界上规模最大的、保存最完好的宫殿建筑群是（ ）

以下给出的各数中不可能是八进制数的是（　　）

过氧化氢（化学式为H₂O₂）溶液在二氧化锰（MnO₂）做催化剂的条件下能迅速分解生成氧气和水，可以通过调节分液漏斗上的活塞控制液体的滴加速度（如图）

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Found

A set of keys. There is a toy bear on it, too.  If you lose it, call me at 880-1167313.  I'm from No. 2 Middle School.

                                                                                            Jack  Lost

An old bike.  It's black with a plastic(塑料的)basket.  Its seat is yellow.  If you find it, please return it to me.  I live in the fifth floor in Building 2.

    Miller   Lost

Yesterday, I lost a novel written by Mo Yan.  Its name is Frog.  I’m eager(渴望的)to find it.  If you find it somewhere, can you return it to me? I’m from Class 6, Grade 7.

                                               Louis