An LED is a coherent light source.
A: 正确
B: 错误
A: 正确
B: 错误
举一反三
- An LED is a coherent light source.
- If a source has no author, what should we consider then in MLA in-text citation? A: Publisher of the source. B: Title of the source. C: Container of the source.
- In integrating a source into a paper, there is no need to provide a context to the source.
- The differences between Loop Lighting and Butterfly Lighting are______. A: The position of main light is lower for Loop Lighting B: The position of main light is higher for Loop Lighting C: The position of light source is closer to subject for Loop Lighting. D: The position of light source is farther to subject for Loop Lighting.
- 4-3。What is the working principle for LED？（ ） A: convert electric to light B: convert light to electric C: convert electric to heat