2010 - 08 - 30 1984 — . Ningxia Engineering Technology Vol. 9 No. 4Dec . 20 10 9 4 2010 12 1671-7244 2010 04-0 398 -0 32005 . . . 102 100 hm 2 43 m 3 m 3. × 105ta . .1 . × 105ta 102 . 1 1× 104m