This is the basis of a laser oscillator(激光振荡器), or laser as it is more simply known.

What is the difference between Selective Laser Melting (SLM) and Laser Metal Deposition (LMD)? A: laser source B: powder distribution C: precision D: protection gas

SLM选区激光熔化制造技术的全称是 A: Laser Solid Forming B: Selective Laser Melting C: Selective Laser Sintering D: Stereo Lithography Apparatus

Which is NOT the correct description about Laser? A: It stands for Light Amplification by Stimulated Emission. B: It’s a beam of light energy. C: All the light waves in a laser are emitted in the same rhythm. D: The light waves in a laser are of different wavelengths.

A laser beam can be turned into a ____ weapon.

A laser weapon is a directed energy weapon that uses a directionally launched ( ) to directly damage or invalidate the target. A: Laser beam B: Electric current C: Missile D: Bullet

According to Para. H, the following conclusions are correct, EXCEPT _____. A: Compared with conventional surgery, the risks of laser surgery are less, which nevertheless depend quite a lot on the skills of individual surgeons. B: Compared with conventional surgery, the time for training to master laser operations is long. C: As for laser operations, a calm temperament and steady hands are as vital as extensive training. D: As for laser operations, severe permanent damage to soft tissue is unavoidable.

【单选题】which one is NOT true about the difference between a color laser printer and a color ink jet printer? A. A color laser printer can print more pretty pictures B. A color inkjet printer is much cheaper C. A color laser printer can print faster

A laser beam can be turned into a______ (dead) weapon.

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