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THE LASER BEAM CAN BE FOCUSED TO SPOT ____________...
THE LASER BEAM CAN BE FOCUSED TO SPOT ____________ THE SIZE OF A HUMAN HAIR
Unit 1: HOME LIFE
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Đáp án tham khảo
25.The laser beam can be focused to spot ____________ the size of a human hair.
A. one fifty B. one fiftieth C. a fifty D. first fiftieth
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25.
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Unit 1: HOME LIFE