硬件 光电开关
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.. raw:: html

   <div style="width: 100%; text-align: center;">
       <video width="100%" controls>
           <source src="https://drestryrobot.oss-cn-shanghai.aliyuncs.com/%E5%85%89%E7%94%B5%E5%BC%80%E5%85%B3.mp4" type="video/mp4">
       </video>
   </div>