u0

And u0 ( x ) > 0 satisfies some smooth and compatibility conditions .

且u0（x）＞0满足一些光滑和相容性条件。

The " People " branch represents a set of users from u0 to uN , where N can be any arbitrary integer .

“People”分支代表从u0到uN的用户集合，其中N可以是任意整数。

The product is suitable to be fixed and laid with the rated power pressure ( U0 / U ) 450 / 750 or less so as to control and monitor return circuit as protect supply line etc.

本产品适用于固定敷设在额定电压（U0/U）为450/750及以下控制、监控回路及保护线路等场合。

Secondly , the traditional method to test the AC voltage / current RMS U / I and initial phase θ u0 / θ i0 , and the impact of noise on the test precision of the AC power characteristic parameters are analyzed .

接着分析了交流电压/电流有效值U/I、电压/电流初始相位角θu0/θi0的传统定义法和噪声因素对这些电力参数测试精度的影响。