It has in the high school student's management work count for much function.
它在中学生的管理工作中起着非常重要的作用。
The invention can position the work head at needed Angle, with high function force.
本发明使工作头部可定位于所需角度,其所承受的作用力较大。
The invention can position the work head at needed Angle, with high function force.
本发明使工作头部可定位于所需角度,其所承受的作用力较大。
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