It is interesting to note that the frequency of bronchitis and pneumonia in Great Britain has been correlated with area of residence in a polluted area and with social class.
值得指出的是，在英国， 支气管炎和肺炎的发病率与污染区域中的居住地区和所属社会阶层有关。
Produces a list of the unique code occurrences and their frequency in an output table for a specified set of fields from an input feature class or table.
对于一个输入元素类或表格中具体指定的一组字段，在一个输出表格中生成一个特定的代码事件及频率列表。
Based on the conventional Class-E resonant high-frequency power amplifier, a new control scheme used in Active-clamped Class-E inverter for ultra-high frequency induction heating is proposed.
以传统的E类高频功率放大电路为基础，提出了应用于高频感应加热电源的有源箝位E类逆变电源的一种新型控制方法。
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