《科技成果》

1999-16, Scientific and Technological Achievements《科技成果》 Stamp Title: Scientific and Technological Achievements Scott No: 2980-83 Serial number: 1999-16 Values in set: 4 (4-1), Early Cambrian Chengjiang Biota, 80 fen, 40*30mm (4-2), 6.000m Underwater Robot, 80 fen, 40*30mm (4-3), The Best Result of Goldbach Conjecture, 80 fen, 30*40mm (4-4), 2.16m Astronomical Telescope, 80 fen, 30*40mm [...]