玻璃纤维：=-（60*x^40+136*x^39-321*x^38-1038*x^37-2045*x^36+2501*x^35+4393*x^34+7347*x^33+4372*x^32-4825*x^31-13838*x^30-19585*x^29-9331*x^28-40213*x ^27+19891*x^26+57417*x^25+68058*x^24+10427*x^23-8789*x^22+6040*x^21-76684*x^20-810 24*x^19-16484*x^18+11908*x^17+42083*x^16+63711*x^15+19938*x^14-2290*x^13-18240*x^12-18560*x^11-7633*x^10+291*x^9+4194*x^8+2502*x^7+378*x^6-361*x^5-240*x^4-33*x^3+27*x^2+5*x-1）/
（60*x^48+256*x^47+35*x^46-1488*x^45-4435*x^44-2543*x^43+7032*x^42+16610*x^41+23043*x*^40+18924*x^39+3186*x^38-57091*x^37-115830*x^36-141242*x^35+18849*x^34+39846*x^33+240064*x^32+433164*x^31+162501*x^30-692061*x ^29-641988*x^28+446013*x^27+530385*x^26+657974*x^25-654746*x^24-708014*x|23-43614*x^22-370550*x^21+356235*x^20+824516*x^19+224413*x^18-94736*x^17-143852*x^16-344353*x^15-110166*x^14+15107*x^13+55317*x^12+51581*x^11+29259*x^10+6818*x^9-5977*x^8-8807*x^7-2453*x^6+1175*x^5+708*x*x^4+15*x^3-55*x^2-6*x+1）：
a： =n->系数（系列（gf，x，n+1），x，n）：
seq（a（n），n=0..30）；
