The Laser: A Scientific & Technological Wonder
The Laser: A Powerful Tool for Communications
The Laser: A Solution to Life-Saving Problems
The Laser: A Multimillion Dollar Invention
The Smart Color Laser Copier is comparable ()professional editing.A.toB.onC.at
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No more than twenty years passed ( ) laser was first invented.A、afterB、sinceC、beforeD、when
Now it is clear that laser light has () applications.A.dangerousB.coherentC.mysteriousD.numerous
Whichofthefollowingprintersprintsmulti－partformsatonce?()A.inkjetB.thermalC.impactD.laser
What is an advantage of an externally modulated laser over a directly modulated laser?()A. lower costB. higher chirpC. easier to manufactureD. higher dispersion toleranceE. higher optical signal-to-noise ratio
Why do the American doctors think of using laser light to treat heart disease?A．Beeause laser light is quite powerful．B．Because laser light is penetrating．C．Because laser light can destroy the blocking materials in human’s artery．D．Because laser light can travel through the human body．
Based on the laser operation treatment of three patients。what can we infer from the passage?A．Laser light treatment is safe and effective．B．Laser light treatment is dangerous and ineffectiveC．Laser light treatment still requires much more studies．D．Government should encourage doctors to do research of laser light treatment on the human body．
