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.The mathematical model of the hyperboloid twist drill was introduced.介绍了以旋转单叶双曲面作麻花钻钻尖后刀面的数学模型.The...

hyperboloid的音标：hyperboloid的英式发音音标为：[haɪ'pɜ:bəlɔɪd]hyperboloid的美式发音音标为：[haɪ'pɜbəˌlɔɪd]...

n.双曲面...