"I did pretty well. I was quite shocked."
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.，更多细节参见夫子
，这一点在safew官方下载中也有详细论述
return j; // 返回pivot的最终位置，详情可参考同城约会
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