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Câu hỏi:
Laser/ device/ concentrate/ light waves/ intense/ beam.
- A. Laser is a device concentrating light waves into an intense light beam.
- B. The laser is a device concentrating light waves on an intense light beam.
- C. The laser is a device which concentrates light waves into an intense light beam.
- D. Laser is a device which concentrates light waves to an intense light beam.
Lời giải tham khảo:
Đáp án đúng: B
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