T-N, T-P and Zn were the priority pollutants to be monitored and controlled in Dongta.

总氨、总磷、锌是重点监测和控制的优先污染物。

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The problem is to determine the optimal replacement policy ( N , T )? such that the long-run expected cost per unit time is minimized.

利用几何过程，以系统大修次数N和大修时间间隔T为更换策略，选择最优策略（ N ， T）使系统经长期运行单位时间的期望费用最小。

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"That would not be a problem at the n. T. S. B.," he said. "If the board found that a part needed to be recalled, they would make that recommendation."

“这在美国国家运输安全委员会内不算什么问题，”他说道，“如果委员会发现了飞机的某些部件需要召回，他们就会发出相应的通知。”

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"That would not be a problem at the n. T. S. B.," he said. "If the board found that a part needed to be recalled, they would make that recommendation."

“这在美国国家运输安全委员会内不算什么问题，”他说道，“如果委员会发现了飞机的某些部件需要召回，他们就会发出相应的通知。”

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