A.2 B.2.3 C.2.5 D.3
A.自然對(duì)數(shù) B.指數(shù)函數(shù) C.下取整 D.上取整
A.離心率 B.自然對(duì)數(shù) C.軸距 D.螺旋軸彎曲度