長城,新皮卡,寬帶,汽車,有多長,汽車vv7,圖片,證券,歐拉,h6

長城(Great Wall),又稱萬里長城,是中國古代的軍事防御工程,是一道高大、堅固而連綿不斷的長垣,用以限隔敵騎的行動。長城不是一道單純孤立的城墻,而是以城墻為主體,同大量的城、障、亭、標相結合的防御體系。長城修筑的歷史可上溯到西周時期,發生在首都鎬京(今陜西西安)的著名的典故“烽火戲諸侯”就源于此。春秋戰國時期列國爭霸,互相防守,長城修筑進入第一個高潮,但此時修筑的長度都比較短。秦滅六國統一天下后,秦始皇連接和修繕戰國長城,始有萬里長城之稱。明朝是最后一個大修長城的朝代,今天人們所看到的長城多是此時修筑。長城資源主要分布在河北、北京、天津、山西、陜西、甘肅、內蒙古、黑龍江、吉林、遼寧、山東、河南、青海、寧夏、新疆等15個省區市。其中陜西省是中國長城資源最為豐富的省份,境內長城長度達1838千米。根據文物和測繪部門的全國性長城資源調查結果,明長城總長度為8851.8千米,秦漢及早期長城...長城

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