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445446 (2007) 16d on , d 1. is to of to it is g to be to in to 1,2. of g of g as In to g of It g 3,4. As g as 5at +86 731 8830257; +86 731 E 6,7Ma et on 8. 9 et 10 on by I11,12. of be by an , is in we to d d on is in 2006 6 005; in of Y) on an of d of or As a of d is to of or of of d of .10083, 00030, 006; 2 006a I) by 8in d . d a on of d at In et 446 (2007) 16)n 1. in (a) A (b) B c) C of be of d 14. be of . in of 1 ) 80C, it is 00 s. is 5 to to of is 80C, is 90 8 h. 20 , an 0:1. mm 6 mm of 6 mm of by a is by of a D/ %3in of 1 of , B It be 1a (9251 (9252 (9252 as d as y, it to be is 1c. , B in 0, 6040it be an on 132 EM It is as 2a. is RD 3. d at It be in in , et 446 (2007) 16 3(a) 2. 4 It is d in in d As 4a c, it to d or be to of in . RD 5 TA of . It at , 15C y be as be of We dY gZn ) 10,15. of TA of gr d of 6 of , B 90C. It is of as 6a, is no RX is . a of In , is RX on of is d an of On of an of b) C to of RX It by at of 7 of 90C. As in of , of b= = 12%; b= = 8%; C b= = 6%). .2%of on g 16y= 0+ ,0K a d is of (In of be to , B in in it to as in 9252 (d is d is in , in . is to no n E to of of is 4. 1, we et 446 (2007) 163. (a) A (b) B c) C d g is 17,18. as , is 12 so (a) Nd , (b) Nd c) Y to be in of of of It is to a of of be of In et 446 (2007) 16 55. of (a) b) of 9,20. of be d In 20. As a is to . of is of a gr a 10. as 16:(1)in to a d is an on g6a I) an d . d d by of of c)90C: (a) A (b) B a on to of of or of of d at et 446 (2007) 167. of 90C: A B In of d of d M. J. K. F. J. S. , 1995, p. 11.2 (1998) 31.3 A. R. A 220 (1996)69.4 7 (1996) 12.5 H. , 2000.6 Y. H. 12 (1996) 81.7 Y. Lu, Q. W. A 278 (2000) 66.8 C. M. W. A 349 (2003) 207.9 A. 49 (2003) 143.10 Y. C. A 373 (2005) 320.11 Q. 61 (1993) 737.12 P. E. N. of 1997.13 J. 230 (1995) 109.14 A 392 (2005)229.15 S. A. J. 14 (5) (1993) 634.16 J. 174 (

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