multiple feedback loop的用法和樣例：
例句
- And the experimental tests had been carried out to verify the established model as well as the dynamic characteristics under opening loop control.
並通過實驗，對所建立的動力學模型及開環控制下平台的實際動態特性進行了驗證。 - A standing-wave-type stepping ultrasonic motor using the alternative operation of two bending vibration modes on the stator has no accumulative errors without the feedback.
摘要利用環形定子的兩個彎振模態交替工作的原理設計的一種駐波型步進式超聲電機具有開環控制下無累積誤差的特性。
