Free Images - SnappyGoat.com- bestof:玄奘大學校徽.jpg en Hsuan Chuang University zh 玄奘大學校徽玄奘大學網頁玄奘大學 Cc-zero Educational institutions established in 1997

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$Wet rough asphalt black bitumen road pavement surface abstract grunge texture close-up top view background banner.\nBitumen is a sticky, black, highly viscous liquid or semi-solid form of petroleum. In the U.S., it is commonly referred to as asphalt. It may be found in natural deposits or may be a refined product, and is classed as a pitch. Before the 20th century, the term asphaltum was also used.\nTarmacadam is a road surfacing material made by combining crushed stone, sand, and tar. It is a more durable and dust-free enhancement of simple compacted stone macadam surfaces. The terms \$