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从理论上导出的()层球处于理想工作状态时最适宜的转速率φ=76%。设想所有的球都集中在某一层上,此球层称为缩聚层,此层球处于理想工作状态导出的转速率φ2=88%。

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Dear Editor,

     I want to say something on behalf of my classmates about the food and water shortages being

experienced in many parts of the world.

________________________________________________________________________

                                                                                                                                                

                                                                                                                    Yours sincerely,

                                                                                                                             Li Hua

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