AJ = �ŷŴ��� Magnetic amplifier AM = ���ӹܷŴ��� Valve amplifier AV = ӡ�Ƶ�·�� Printed circuit board AP = ����� Drawer AT = ֧���� Rack AR = �ǵ����� �����任 ������� ���ǵ��� �任�� �ȵ紫���� Ther moelectric sensor B = �ȵ�� Thermo--cell ���� Photoelectric cell ��� Dynamometer ���廻���� Crystal transducer��һҳ[1][2][3][4]��һҳ
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