化学方程式：4Al+3O₂2Al₂O₃可读作____ ．

已知$\left\{\begin{array}{c}4x-5y+2z=0\\ x+4y-3z=0\end{array}\right.$（xyz≠0），则x：y：z的值为（　　）

                                                                                                      登岳阳楼
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                                                                                          吴楚东南坼，乾坤日夜浮。
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