試題詳解

試卷：無年度 - 96年8月TOFEL閱讀(Page43-44)#20919 | 科目：TOEFL(Test of English as a Foreign Language)托福

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試卷名稱：無年度 - 96年8月TOFEL閱讀(Page43-44)#20919

科目：TOEFL(Test of English as a Foreign Language)托福

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

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