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One reason for routinely launching GPS satellites is simply "constellation replenishment," said Col. Andrew Menschner, deputy commander of the Space Force's Space Systems Command. Old satellites degrade and die, and new ones need to go up and replace them. At least 24 GPS satellites are needed for global coverage, and having additional satellites in the fleet can improve navigation precision. Today, there are 31 GPS satellites in operational service, flying more than 12,000 miles (20,000 kilometers) above the Earth.
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（一）违反本法第十六条、第十七条第一款、第二款的规定，未落实实名注册等制度，依法核验用户真实身份的；
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Viren Swami, Professor of Social Psychology at Anglia Ruskin University (ARU), in Cambridge, has traced our contemporary European understanding of romantic love back to medieval Europe and those stories of Camelot, Lancelot, Guinevere and the chivalry of the knights of the round table that swept across the continent.