sf.gov.cn.		30 IN SOA ns.sf.gov.cn. root.sf.gov.cn. (
				2403011405 ; serial
				3600       ; refresh (1 hour)
				1800       ; retry (30 minutes)
				604800     ; expire (1 week)
				3600       ; minimum (1 hour)
				)

Name servers:
sf.gov.cn.		30 IN NS ns.sf.gov.cn.