Due to the complex environmental conditions of the site construction, in order to ensure the accuracy of the site construction measurement and measurement, we will strictly abide by the relevant measurement regulations in the ISO9001 series quality standards after using the measurement and measurement instruments for a period of time, send the instruments used by the project department to the metrological identification department for re inspection, and put them into use on the construction site only after the re inspection and maintenance are qualified, and assign special personnel to be responsible for keeping them
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