| | | | 20 | | 6 | | | | | | | 6 | | 11 | 12 | | | | | | | | | | | | 3 5 | | | 6 | | | | | | | | | | | 1 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 6‰ | 1000 6 | 1000 0.006 6 = 36 | 1000 12 | 1000 0.006 12= 72 | | | | | | | | | | | | | | | | 20 50 | | | | | | | |
2015.11.24 15:41 
