characteristic life是什么意思 characteristic life怎么读
characteristic life的用法和样例
- The paper derives out the proper power supply voltage of city road lighting according to the illuminance and life span character at different voltage level.
摘要根据路灯在不同电压下的照度及寿命特性,推导出城市道路照明灯具的最佳供电电压。
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