输出波形精度高，失真小线性好。
High precision of output waveform, good linearity distortion.
优点是制作相对容易，线性好、失真小、频响宽。
Advantage is relatively easy to produce, linear, and distortion of small, wide frequency response.
主要优点失真小，放大倍数高以及增益大小可编程控制。
Its main advantages are low distortion and high magnification times. In addition, its gain magnitude can be controlled through programming.
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