Singlechip AT89C52 was adopted by intelligent real available value voltage-monitoring apparatus to sample N times for the electrical network voltage between equal spaces in one cycle.

智能型真有效值电压监测仪，采用AT89C52单片机，在一个周期内对电网电压等间距采样N次。

youdao

The population mean is often written "x-bar." If you have a sample with n observations, it's the summation i = 1 to n of xi/n--that's the average.

人口均值经常写成“x-条形柱”，如果你有一个样本有n个观测者，是从 i=1到n和的xi/n，这是平均值。

youdao

The total nitrogen(N) content was determined with Kjeldahl to study the influences of temperature, digesting time and sample dosage on the course of digesting wild H.

用凯氏定氮法测定总氮含量，研究温度、消化时间及样品用量对野生竹红菌消化过程的影响。

youdao

If you have a sample with n observations, it's the summation I = 1 to n of xi/n--that's the average.

如果你有n个观测值,对Xi从i=1到n求和再除以n

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