发布时间:2025-02-07 11:49:04
单相就是一根火线一根零线。相间电压是220V。三相就是三根火线,一根零线。三根火线任何两相的电压均是380V,任何一根火线和零线的电压均是220V
化学冰袋的奥秘 课题提出有怎样的意义 以及实际的解决什么问题
2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04 2025-02-07 11:49:04