在没有外界反馈电路时所测出的电压放大倍数。Auo越高, 所构成的运算电路越稳定,运算精度也越高。Auo一般约为 104 107。-in the absence of external feedback circuit by measuring the voltage amplification. Auo higher posed by computing circuit, the more stable operating precision higher. Auo normall