วันพุธที่ 12 กรกฎาคม พ.ศ. 2560

Customs

Customs
Customs is an authority or agency in a country responsible for collecting tariffs and for controlling the flow of goods, including animals, transports, personal effects, and hazardous items, into and out of a country.[1] The movement of people into and out of a country is normally monitored by immigration authorities, under a variety of names and arrangements. The immigration authorities normally check for appropriate documentation, verify that a person is en อ่านเพิ่มเติม

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Inventors and Their Inventions

Inventors and Their Inventions Archimedes  (287 BCE –  c.  212 BCE) Archimedes of Syracuse was an ancient Greek mathematician, physicis...