提出在卷筒包装纸进退式光电定位系统中，采用无触点（全电子式）比较判别及控制电路，替代目前常用的触．点式同类电路。
It is suggested in this paper that a kind of contact-free circuit for comparison and control should substitute for the conventional contact one in the back-forth wrapper web position control system.
进行设计和定位的核心业务，反映您的目的，使命和信念在每一个接触点。
Make design and positioning the heart of your business, reflecting your purpose, mission and values at every touch point.
确定位置后，应用绳索固定三个点，严禁用铁丝固定，以防发生触点事故和增氧机工作时自动移位和晃动。
As the position determined, fix 3 points with rope, and iron wire is forbidden, in order to avoid contact accident and self shifting and shaking while operating.
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