磁信号放大检验显示器由小功率双运放大器耦合一个检验显示开关电路而成；
The magnetic induction head is electrically connected with the input end of the magnetic signal amplifying test display;
磁信号放大检验显示器由小功率双运放大器耦合一个检验显示开关电路而成；
The magnetic induction head is electrically connected with the input end of the magnetic signal amplifying test display;
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