( )evidence that language acquiring ability must be stimulated.

In this research at Columbia University, Charles Townes worked with ______. A: stimulated emission B: microwaves C: maser D: stimulated emission and microwaves

The light emitted by the LED is incoherent light, and its basic principle is . A: spontaneous radiation B: stimulated absorption C: stimulated radiation D: spontaneous absorption

The light emitted by the LED is incoherent light, and its basic principle is . A: stimulated absorption B: spontaneous radiation C: stimulated radiation D: spontaneous radiation

The<br/>three basic processes involved in generating laser include:() A: spontaneous<br/>radiation B: stimulated<br/>emission C: stimulated<br/>absorption D: laser<br/>amplification

They ____me to make greater efforts. A: helped B: stimulated C: excited D: inspired

The invention of the industrial robot is _______ to the company. A: unified B: credited C: approved D: stimulated

Skeletal muscles are always stimulated to contract by: A: arteries. B: hormones. C: nerves. D: veins.

These startling events _______ intense excitement throughout Europe. A: stimulated B: aroused C: provoked D: irritated

4.A good brain made it possible for man to make tools which in turn stimulated the development of the brain.