彩票天下
<tr id='UGkduQ'><strong id='UGkduQ'></strong><small id='UGkduQ'></small><button id='UGkduQ'></button><li id='UGkduQ'><noscript id='UGkduQ'><big id='UGkduQ'></big><dt id='UGkduQ'></dt></noscript></li></tr><ol id='UGkduQ'><option id='UGkduQ'><table id='UGkduQ'><blockquote id='UGkduQ'><tbody id='UGkduQ'></tbody></blockquote></table></option></ol><u id='UGkduQ'></u><kbd id='UGkduQ'><kbd id='UGkduQ'></kbd></kbd>
翻页激光教鞭运用了计算机的USB技术,红外（射频）技术,集遥控电脑功能与激光教鞭于一身,是配合PC机或手提电脑,结合投影仪使用而广泛用于产品演示, 电化教学及学术会议等场合的理想演示工具.
