read these sentences through then replace quality and characteristic y property or grade
1. materials are accurately tested so that their electrical characteristics can be assesse and compared
2. the oxid film which forms on alluminium increas its corrosion-resisting qualities
3. the body of a high breaking capacity cartridge fuse is of high-qualitiy ceramic
4. the most important quality of copper is its high electrical conductivity
5.in the early 20th century it was discovered that electron emission from heated metals is a true quality of the metals themselves and is not a secondary effect due to the presence of gas
6. paper thugh higly hygrospocpic is used as an insulator in many applications on account of its flexibility and good electric qualities
7. welded-seam conduit is used for most commercial quality installation work
8. the magnetic qualities of iron and cerain special iron alloys are essential to commercial electrical machine and trasformers
9. the quality of this uranium ore is too low for economic working
10. it is seldom possible to obtai in one material the ideal mechanical and electrical characteristics
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