... error of closure in leveling 水准闭合差 exact leveling 精平、确置平 level 水准仪（测点） ...
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By use of VVVF technology to directly control elevator door operation simplified the mechanical structure of elevator door device with low noise in door closing and leveling in exact position.
采用VVVF技术对电梯开门机直接拖动，使电梯门机装置机械结构简化，关闭时噪声低，且可靠到位。
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