【单选题】
In his research at Columbia University, Charles Townes worked with all of the following EXCEPT _________.
A.stimulated emission
B.microwaves
C.light amplification
D.a maser
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根据网考网移动考试中心的统计,该试题:
12%的考友选择了A选项
17%的考友选择了B选项
51%的考友选择了C选项
20%的考友选择了D选项