该方法确定的避雷针保护范围明确,无绕击雷害。
The Analysis Calculation and Computer Aided Design on the Protection Area of the Lightning Rod;
第一种是自行改进设计的绕丝针翅管。
The first tube was winded pin-fin tube which was improved and self-designed.
第一种是自行改进设计的绕丝针翅管。
The first tube was winded pin-fin tube which was improved and self-designed.
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