U型曲线
- 网络U-shaped curve;u-shaped relationship;U-shaped pattern
U型曲线-
其中，工业废水呈现非EKC特征，而工业废气与工业固废、二氧化硫则呈倒u型曲线的前半部分，而COD呈明显的三次曲线特征。
The industrial waste water showed non-EKC characteristics while the industrial solid wastes and industrial emissions ( include SO2 ) clearly showed the characteristics of cubic curves .
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采用非对称碰撞直接测量法测量并计算了击波速度（D）与波后粒子速度（u），建立了D-u型的Hugoniot曲线，并由此推导了两种P-η型的状态方程。
The shock wave velocity ( D ) and the particle velocity at wave wear ( u ) were measured and calculated by using Asymmetry Impact and Direct Measurement . D-u type Hugoniot curve are obtained and two kinds of P - η equations of state are deduced .