Laser / device / concentrate / light waves / intense beam

Câu hỏi :

Choose the correct answer that complete these given words.

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.

* Đáp án

A

* Hướng dẫn giải

Đáp án A

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