That type of circuit has the advantages of simple structure and high efficiency.
这类电路的优点是结构简单、效率高。
Double circuit, air brake, drum type.
双电路，空气制动，滚筒式。
The invention relates to a thin type speaker magnetic circuit.
本发明涉及一种薄型扬声器磁路。
The invention relates to a thin type speaker magnetic circuit.
本发明涉及一种薄型扬声器磁路。
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