3.3.1 Instruments⭐各种仪器工具

Scales and rulers are used to measure weight and length. 

Units of weight include kilograms and pounds and units of length include centimeters and inches.

These instruments are used to observe very large and very small objects. 

Telescopes are used by astronomers, and microscopes are used by biologists and doctors.

These appliances are used in the kitchens of almost every home. 

Stoves are used to heat food and refrigerators are used to keep foods cool or cold.

Household tools like these, are used to build or repair things. 

Hammers are used to pound in nails and screwdrivers are used to turn a screw.

We can use a telescope to see objects that are far away

Rulers are used to measure length.