While all modern op amps have push-pull OUTPUT stages of some sort, many are still asymmetrical, and have a greater slew rate in one direction than the other.
现代运算放大器有某种方式的推挽式的输出级，许多也是不对称的，并且某一方向的压摆率有比其它方向的有更大的倾向。
The earliest IC op amp OUTPUT stages were NPN emitter followers with NPN current sources or resistive pull-downs, as shown in Figure 1.6.
最初的集成运算放大器的输出级是NPN电流源的NPN放射追随器或通过电阻下拉，如图1.6所示。
When price had fallen to the legal minimum, OP, output would be OQ.
当价格下降到法定最低价格OP时，产出会是OQ。
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