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In 1980, General Secretary and reformist Hu Yaobang visited Tibet and ushered in a period of social, political, and economic liberalization. At the end of the decade, however, analogously to the Tiananmen Square protests of 1989, monks in the Drepung and Sera monasteries started protesting for independence, and so the government halted reforms and started an anti-separatist campaign. Human rights organisations have been critical of the Beijing and Lhasa governments' approach to human rights in the region when cracking down on separatist convulsions that have occurred around monasteries and cities, most recently in the 2008 Tibetan unrest.

When did Hu Yaobang visit Tibet?
Answer: 1980
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The Valencian economy recovered during the 18th century with the rising manufacture of woven silk and ceramic tiles. The Palau de Justícia is an example of the affluence manifested in the most prosperous times of Bourbon rule (1758–1802) during the rule of Charles III. The 18th century was the age of the Enlightenment in Europe, and its humanistic ideals influenced such men as Gregory Maians and Perez Bayer in Valencia, who maintained correspondence with the leading French and German thinkers of the time. In this atmosphere of the exaltation of ideas the Economic Society of Friends of the Country (Societat Econòmica d'Amics del País) was founded in 1776; it introduced numerous improvements in agriculture and industry and promoted various cultural, civic, and economic institutions in Valencia.

When was the Economic Society of Friends created?
Answer: 1776
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Y-Gerät was the most complex system of the three. It was, in effect, an automatic beam-tracking system, operated through the bomber's autopilot. The single approach beam along which the bomber tracked was monitored by a ground controller. The signals from the station were retransmitted by the bomber's equipment. This way the distance the bomber travelled along the beam could be precisely verified. Direction-finding checks also enabled the controller to keep the crew on an exact course. The crew would be ordered to drop their bombs either by issue of a code word by the ground controller, or at the conclusion of the signal transmissions which would stop. Although its maximum usable range was similar to the previous systems, it was not unknown for specific buildings to be hit.

Which system was the most complex of the three?
Answer:
Y-Gerät