电梯导轨安装精度以往多采用吊线锤法，一般很难保证导轨的安装精度，且费时、费力。
Using traditional plumb lines in elevator guide rails' installation is difficult to ensure the installation accuracy, wasting time and Labour.
电梯导轨安装精度以往多采用吊线锤法，一般很难保证导轨的安装精度，且费时、费力。
Using traditional plumb lines in elevator guide rails' installation is difficult to ensure the installation accuracy, wasting time and Labour.
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