Length is the most basic kind of value, and can export many other quantities. China's current measuring blocks and measuring instruments are sent for inspection and are transmitted step by step. The monitoring process cannot be monitored to ensure the accuracy and reliability of the results. . In 1987, the International Organization for Standardization officially released the ISO9000 series of standards, and proposed new requirements for measurement quality assurance. It has become the standard for international trade buyers and suppliers to order and accept. It is necessary to reform the open-loop system of China's quantitative transmission and replace it with a continuous monitoring program for measurement quality. The new national standard GB/T19000 has the same technical content as the ISO9000 series standard, and has been used as the quality system for the enterprise.
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