Many simple machines are taken for granted. How would we manage without wheels, pulleys, ramps, wedges or screws? These are all types of machine. They make it easier to do something. This series explores a range of similar devices at a level suitable for children working at Key Stage One.
- Limba : Engleza
- Data Publicarii : 30 Sep 2004
- Format : Paperback
- Numar pagini : 32
- ISBN : 9780431179001