防雷技术问答
1、假如已经安装了避雷针，还需要电涌防护器吗？
2、电源线保护器（SPD）与数据线保护器（DLP）有何区别？仅安装一种是否可以起到防护作用？
3、如何选择电涌防护器的型
4、如果在建筑物入口处安装了电涌防护器，在建筑物内部是否还需要安装其他的电涌防护器？
5、在恶劣的电源条件下，压敏电阻能长期保持有效吗？
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