RELATION OF FREQUENCY IN NORTHEAST POWER GIRD TO POWER FLOW IN TIE-LINE BETWEEN NORTHEAST AND NORTH CHINA POWER GRIDS是什麼意思_RELATION OF FREQUENCY IN NORTHEAST POWER GIRD TO POWER FLOW IN TIE-LINE BETWEEN NORTHEAST AND NORTH CHINA POWER GRIDS在線翻譯_英語_讀音_用法_例句