点间距:3.91,4.81
点间距:4,5,8,10
点间距:2.604,2.976,3.91,4.81,5.95
点间距:2.5,3,3.076,4,5,6,6.67,10
点间距:2.5,3,3.076,4,5,6,6.67,8,10
点间距:4,5