Dr. Frank Conrad's musical radio broadcasts in 1919 led Westinghouse open the first fully licensed commercial broadcasting system in the United States on November 2nd, 1920.
Câu hỏi
Nhận biếtDr. Frank Conrad's musical radio broadcasts in 1919 led Westinghouse open the first fully licensed commercial broadcasting system in the United States on November 2nd, 1920.
Đáp án đúng: B
Lời giải của Luyện Tập 365
open sửa thành opened
open sửa thành opened
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