問題詳情

【題組】6. In his research at Columbia University, Charles Townes worded with all of the following EXCEPT
(A) stimulated emission
(B) microwaves
(C) light amplification
(D) a maser

參考答案

答案：C
難度：非常簡單1
統計：A(0),B(0),C(3),D(0),E(0)