【单选题】
Practical application of this principle resulted in ____________.
A.new electronic instruments for planes
B.new radio sets for RAF bombers
C.an electronic detecting device
D.a radio directing and ranging device
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根据网考网移动考试中心的统计,该试题:
9%的考友选择了A选项
21%的考友选择了B选项
4%的考友选择了C选项
66%的考友选择了D选项