| ︹ 2021 ︺ 24 | 2021 11 8 | | | | | | | | | | ︹ 2015 ︺ 71 | | ︹ 2017 ︺ 142 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | GB/T29490 | 2013 | | | | | | | | | | | | | | | | | | | | | | 1. 5000 | 5 | 2. | 3000 | | | | 10 | 10 | | 50 20 10 | 15 | 10 5 | 10 5 3 | | | | | 50 | 50 | GB/T29490 | 2013 | | | | | 50 30 | 20 | | 10 | | | | 50 30 | | | 20 10 | | | | | | | | | | | / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 5 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 30 | | | |