Calculating design drainage discharge have important significance for water safety and derating economic losses of waterlog in the polder areas.

圩区设计排涝流量计算，对圩区的水安全，有效减免涝灾经济损失有着重要意义。

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The technique plays an important role in the proper selection of parts, thermal electrical stress control in the circuit design and derating.

说明这一方法对元器件的正确选择、电路设计中热电应力的控制和降额等可靠性设计起主导的作用。

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Then, combined with the tax substantive law, explicate how the new tax model rely on the existing tax kind to design the derating plan.

本文还结合税收实体法，对新模型如何依托现有税种设计减免方案进行了详细说明。

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