| | | | | 2017 186 | | 2018 12 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | GB/T4754 2017 2012 | 2018 74 | | | | | | | | 14 | | | | | | | | | | | | | 1. | | | | | 2. | | | | | | | | | | | | | | | | 3. | | | | | 4. | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2000 | 500 | 200 | 1000 500 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2019 4 8 | | | | | |