ch4-2nlnk1.asp	Ӧʾһ	ǵһ
ch4-2nlnk2.asp	Ӧʾ	ǵڶ
ch4-2nlnk3.asp	Ӧʾ	ǵ
ch4-2nlnk4.asp	Ӧʾ	ǵĸ
