Which of the following statements does not agree with the facts in the passage?A.The displ
Which of the following statements does not agree with the facts in the passage?
A.The displays in digital clocks and calculators are just produced by early LEDs.
B.Irvine-Halliday believes that LED will certainly become the world's main source of artificial light.
C.A decade ago, engineers developed red and blue LEDs, which were regarded as a mile-stone in this research.
D.It is the blue LED developed by a Japanese engineer that had a great impact on the research process.