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.
In the 1970s and 80s, Neil Murray was a heavy metal guitar legend who played bass with some of the biggest rock bands on the planet.
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怎样创造政绩？关键靠实干，这是最质朴的方法论，是成就事业的必由之路。
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