LASER / DEVICE / CONCENTRATE / LIGHT WAVES / INTENSE BEAM.A.LASER IS A...
Câu 23:Laser / device / concentrate / light waves / intense beam.A.Laser is a device which concentrates light waves into an intense light beam.B.The laser is a device which concentrates light waves and an intense light beam.C.Laser is a device concentrates light waves into an intense light beam.D.The laser is a device to concentrate light waves to an intense light beam.