A down flow biological to discuss the stability of nitrite under high concentration of ammonia.

本文采用下向流内循环生物流化床反应器,在高浓度氨条件下,探讨了亚硝化过程的稳定性.

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Rather than a top - down flow of ideas, top management encourages employees and franchises to suggest innovations.

公司管理高层鼓励员工和特许经营商提出创新意见, 而不是采用自上而下的指令传达模式.

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