A light-emitting diode (LED) is a two-lead semiconductor light source.It is a p–n junction diode that emits light when activated. When a suitable current is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons.
The Wuhan Gang & The Chungking Gang, i.e., the offsprings of the American missionaries, diplomats, military officers, 'revolutionaries' & Red Saboteurs and the "Old China Hands" of the 1920s and the herald-runners of the Dixie Mission of the 1940s.
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Nanjing ( listen), formerly romanized as Nanking and Nankin, is the capital of Jiangsu province of the People's Republic of China and the second largest city in the East China region, with an administrative area of 6,600 km 2 (2,500 sq mi) and a total population of 8,270,500 as of 2016.