0:000:00
<p style="font-size:17px;line-height:30px;margin:10px 0px;color:#333333;font-weight:900;" lang="en" data-flag="subtitle">【第5.04讲】凸透镜成像1阶应用</p><p style="font-size:16px;line-height:30px;font-family:Helvetica, Arial, sans-serif;color:#333333;font-weight:normal;text-align:justify;" lang="en" data-flag="normal"><img data-key="0" src="http://imagev2.xmcdn.com/storages/4ca3-audiofreehighqps/7A/3C/GKwRIRwIVg6iAAKbigImh8dJ.jpg!op_type=4&upload_type=attachment&device_type=ios&name=mobile_large" alt="" data-origin="http://fdfs.xmcdn.com/storages/4ca3-audiofreehighqps/7A/3C/GKwRIRwIVg6iAAKbigImh8dJ.jpg" data-preview-width="140" data-large="http://imagev2.xmcdn.com/storages/4ca3-audiofreehighqps/7A/3C/GKwRIRwIVg6iAAKbigImh8dJ.jpg!op_type=4&upload_type=attachment&device_type=ios&name=mobile_large" data-large-height="191" data-preview="http://imagev2.xmcdn.com/storages/4ca3-audiofreehighqps/7A/3C/GKwRIRwIVg6iAAKbigImh8dJ.jpg!op_type=4&upload_type=attachment&device_type...