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Утас: 70179577, 70179777, 70180632, 70180631 : Факс: 70180631 : И-мэйл: [email protected] : Хаяг:
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Introduction The earliest magnetic tool was compass. Greek sailors used magnet to make compass, which can indicate direction. An object was floating in a bowl full of water. The sailor put a needle magnet on the object. One end of the magnet pointed north and the other end pointed south. A compas...
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