[国外标准] SAE J371-1993 DRAIN,FILL,AND LEVEL PLUGS FOR OFF-ROAD,SELF-PROPELLED WORK MACHINES
[国外标准] BS EN 752-7-1998 Drain and sewer systems outside buildings. Maintenance and operations
[国外标准] BS EN 752-2-1996 Drain and sewer systems outside building
[国外标准] BS EN 752-1-1996 Drain and sewer systems outside building