传统光学水准仪主要靠人工目视读数，存在精度低、测量速度慢、易受人为影响等问题。

Less accuracy, lower speed and easy to be influenced by individuals are characteristic of the traditional optical level, on which the measured data are read by human eyes mainly.

youdao

传统光学水准仪主要靠人工目视读数，存在精度低、测量速度慢、易受人为影响等问题。

Less accuracy, lower speed and easy to be influenced by individuals are characteristic of the traditional optical level, on which the measured data are read by human eyes mainly.

youdao