????$B&N(B??

???	?????
???	??$(D*2)L(B $(D"1(B?$B!k$(D+@"B"p(B?$(D+)*)*#(B ?$(D"B*1$B!x$(D"B"p*.)N*)*#(B ?$B!k$(D*"+1*?"k(B
????	$(D*)$B"L!^$(D)P"p(B?$(D"p(B?$(D"p"p***?*3"B"p+R*?*P"p"p"p"D(B?$(D)C(B?$(D*4(B?$(D+2*!+d"p(B?$(D"p+1"p*B$B!-$(D*.*2*#*4"1(B?$(D+b*B+Q*B*B$B!k$(D+2"p*B**+4(B??
??????	$(D"D"n(B?$(D),*A*"(B(D-II)
Vol.	J80-D-II
No.	6
?????	pp.1617-1626
???	1997?6??

????????