A stepper motor, which can be turned a degree at a time, would twist the wand back and forth as needed.

　
英 美
  • 至于一次可以轉一度的步進(jìn)馬達，會(huì )在必要的時(shí)候來(lái)回推動(dòng)百葉窗的控制桿。
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