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1 dzień temu · A car, or an automobile, is a motor vehicle with wheels.Most definitions of cars state that they run primarily on roads, seat one to eight people, have four wheels, and mainly transport people over cargo.. The French inventor Nicolas-Joseph Cugnot built the first steam-powered road vehicle in 1769, while the Swiss inventor François Isaac de Rivaz designed and constructed the first internal ...
1 dzień temu · A cross section of the shore-end of a modern submarine communications cable. 1 – Polyethylene 2 – Mylar tape 3 – Stranded steel wires 4 – Aluminium water barrier 5 – Polycarbonate 6 – Copper or aluminium tube 7 – Petroleum jelly 8 – Optical fibers Submarine cables are laid using special cable layer ships, such as the modern René Descartes [], operated by Orange Marine.
1 dzień temu · Therefore, a = 0 and b 2 + c 2 + d 2 = 1. In other words: A quaternion squares to −1 if and only if it is a vector quaternion with norm 1. By definition, the set of all such vectors forms the unit sphere. Only negative real quaternions have infinitely many square roots. All others have just two (or one in the case of 0). [citation needed]
1 dzień temu · International law (also known as public international law and the law of nations) is the set of rules, norms, and standards that states and other actors feel an obligation to obey in their mutual relations and generally do obey. In internation relations, actors are simply the individuals and collective entities, such as states and international organizations, which can make behavioral choices ...
1 godzinę temu · The tiger (Panthera tigris) is a member of the genus Panthera and the largest living cat species native to Asia.It has a powerful, muscular body with a large head and paws, a long tail and orange fur with black, mostly vertical stripes. It is traditionally classified into nine recent subspecies, though some recognise only two subspecies, mainland Asian tigers and the island tigers of the Sunda ...
1 dzień temu · The Royal Air Force (RAF) is the air and space force of the United Kingdom, British Overseas Territories and Crown Dependencies. It was formed towards the end of the First World War on 1 April 1918, becoming the second independent air force in the world after the Finnish Air Force (established 6 March 1918), by merging the Royal Flying Corps (RFC) and the Royal Naval Air Service (RNAS).
1 dzień temu · Definition and overview. Hygiene is a practice related to lifestyle, cleanliness, health, and medicine.In medicine and everyday life, hygiene practices are preventive measures that reduce the incidence and spread of germs leading to disease.. Hygiene practices vary from one culture to another.. In the manufacturing of food, pharmaceuticals, cosmetics, and other products, good hygiene is a ...
