shi gong zhong guang xue jing wei yi de zhi liang xian zhuang ji jian yi
The optical theodolite is one of the most important metrology instruments in construction enterprises. The precision of the instrument often declines;and even it is demaged due to a variety of reasons. Therefore;if we strengthen the verification of the theodolite regularly;realize the usuage of the qualified instrument;there will be of great significance in improving the precision of measurement and ensuring the engineering qualiy.
..............page:49-50