... permanent magnet moving coil instrument 永磁动圈式仪表 permanent magnet moving iron instrument 永磁动铁式仪表 permanent magnet relay 永磁式继电器 ...
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permanent magnet moving-iron instrument 永磁动铁式仪表
permanent-magnet moving-iron instrument [仪] 永磁动铁式仪表 ; 极化电磁系仪表
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