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...
旨在缓解失业冲击的项目进展得并不太顺利，参议员萨班斯对此表示关切。Senator Sarbanes expressed concern that programs designed to soften the blow of unemployment are not working well.我们可以想像检波器受几万个砂粒冲击的情景.We can imagine a seismic detector being bombarded by...