The authors show that the hyperboloid of one sheet and the hyperbolic paraboloid are ruled surfaces.作者证实:单叶双曲面和双曲抛物面是直线曲面.Two fdmilies Of characteristic lines in the hyperbolic region are not orthogonal.在双曲型区域两族特征线互不正交.F...
拉什顿创造了行业奇迹。Rushton has done wonders for the industry.他在拉什顿面前竭力振作起精神.He contrived to keep up appearances to a certain extent before Rushton.拉什顿因这件事很不开心.Rushton felt rather sick over this affair....