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- Steel (28384 bytes)
3: ...on, but is also more [[brittle]]. One classical definition is that steels are iron-carbon alloys with ...
5: ...carbon, if present, is undesired. A more recent definition is that steels are iron-based alloys that c...
8: ... carbon. This process, known as [[smelting]], was first applied to metals with lower [[melting]] point...
11: ...dy-centered cubic to a [[face-centered cubic]] configuration, called '''[[austenite]]''' or '''γ...
13: ...cally [[metastable]] substance with about four to five times the strength of ferrite. Martensite has ... - People's Republic of China (40848 bytes)
1: ...]], [[Tajikistan]] and [[Vietnam]]. Although it officially remains a [[communist state]], the PRC has ...
15: ...a's unity and [[sovereignty]] was assured for the first time in a century, and there was development o...
17: ...his to natural disasters; still others doubt this figure entirely, or claim that many more people died...
25: ...d [[unemployment]] associated with layoffs at inefficient state-owned enterprises, and has introduced ...
40: ...g social problems and exposing corruption and inefficiency at lower levels of government. The Party ha... - Iron Age (8996 bytes)
5: ...pe where the Iron Age distinction was first identified; the [[Nordic]] Iron Age and [[Roman Iron Age]]...
10: ...eing created then as a by-product of [[copper]] refining, as [[sponge iron]], and was not reproducible...
21: ...ntacts with the area in which iron technology was first developed at the time that it was developing.
24: ...[14th century BC]] was excavated.After the scientific examination, this kind of iron came from [[aero...
27: ... age, found at ֬and large.jpg|thumb|200px|Bronze figurine, found at ֬and]] - Great Wall of China (10504 bytes)
1: ...s|¹]] is an ancient [[China|Chinese]] [[fortification]] built from the end of the [[15th century]...
5: ...s built during the reign of [[Qin Shi Huangdi|The First Emperor]], the main emperor of the short-lived...
11: # [[1138]] - [[1198]] (the [[Five Dynasties and Ten Kingdoms Period]])
18: ...]]. Spanning nine provinces and 100 counties, the final 500 kilometers have all but turned to rubble, ...
24: ...ads. Sections of the Wall are also prone to [[graffiti]]. Parts have been bulldozed because the Wall i...
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