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<正>在古代,由于海上贸易和战争的需要出现了两种船,一种是使用风帆的,船体较宽的运货商船;一种是平时用帆,作战时收起,用人力划桨,船身瘦长的战船。第一艘大海船可能是埃及人在尼罗河上建造的。公元前1400年,由于古希腊文明和 相似文献
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乐山大佛地处四川省乐山市,是岷江、青衣江、大渡河三江汇流处,与乐山城隔江相望。乐山大佛雕凿在岷江、青衣江、大渡河汇流处岩壁上,依岷江南岸凌云山栖霞峰临江峭壁凿造而成,又名凌云大佛,为弥勒佛坐像,是唐代摩崖造像的艺术精品之一,是世界上最大的石刻弥勒佛坐像。乐山大佛开凿于唐代开元元年 相似文献
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EldawiMG FarwaAG LiuTianyou 《中国地质大学学报(英文版)》2003,14(4):368-373
Vertical electrical sounding (VES) was carried out in the east of the River Nile. The main objectives of the resistivity survey are to determine the types and thicknesses of sedimentary units in the area, to define the contact separating the sediments from the crystalline basement complex, and to determine the structural features of the subsurface formations. Several local depressions, whose maximum depth to the Imsement surface is about 160 m, are revealed as an outcome of the VES method, and suggested to have been infilled with undifferentiated units of the Nubian Group in particular Omdurman Formation. Thus, a depth to the basement complex is calculated and the associated structural map of the east of the River Nile is drawn. The map is useful for the groundwater drilling, as far as the presence or absence of the aquifer is concerned. 相似文献