Inspection standard of plastic-coated hose
Inspection standard of plastic-coated hose Plastic-coated hose is a more common type of hose in our lives. The hoses of the same variety, same inner diameter, and 1000 meters long are used as a batch during inspection. Randomly extract 100 meters from it for appearance inspection. The inner diameter of the sample should meet the requirements of this standard. The arithmetic average of the weigh