[河北省地方标准] DB1302/T 500-2019 蓝莓栽培技术规程
[青海地方标准] DB63/500-2005 马铃薯青薯６号
[国外标准] DIN 3567-1963 20至500NW的管夹
[国外标准] ETSI EN 302 500-2 V1.2.1 (2008-06) Electromagnetic compatibility and Radio spectrum Matters (ERM); S
[国外标准] ETSI EN 302 500-2 V1.2.1 (2008) Electromagnetic compatibility and Radio spectrum Matters (ERM); Shor