Light bulbs _e____ light and heat. (发出)
举一反三
- 4-3。What is the working principle for LED？（ ） A: convert electric to light B: convert light to electric C: convert electric to heat
- The sun gives light and heat, ___ makes it possible for plants to grow.
- It is said that the new light bulbs [input=type:blank,size:4][/input]less electricity.( consume, consumption)
- 翻译句子：Heat and light can be given off by the chemical change.
- There are five things which teas are vulnerable to: light, air, heat, odors and ()