英语词典
Turn arm was joined with pressure spring join rod of contactor, and magnetic circuit with lesser magnetic resistance consisted of magnetic fields of move iron core and permanent magnet to form retentiveness.
拐臂和触头压力弹簧的连杆相连，动静铁心对永久磁铁的磁场构成小磁阻磁路，形成保持力。
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