更多retentivity例句

1. Hardened steel has a high degree of retentivity, while soft iron retains but little magnetism.
2. Name an object whose usefulness depends upon its retentivity.
3. If required for permanent magnet making, it should have the highest possible coercivity combined with a high retentivity.
4. The power that a piece of steel has to hold magnetism is called retentivity.
5. Soft steel has very little retentivity, because it does not contain much carbon.