問題詳情
【題組】4. Which of the following statements best describes a laser?
(A) A device for stimulating atoms and molecules to emit light
(B) An atom in a high-energy state
(C) A technique for destroying atoms or molecules
(D) An instrument for measuring light waves
參考答案
答案：A
難度：適中0.666667
統計：A(2),B(1),C(0),D(0),E(0)