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...
Almost 80 percent of the state's residents were born elsewhere...该州居民中几乎有80%出生在异地。Primary color which is ninety percent ( 90 % ) or more shall disqualify.主要颜色占90%或更多属于失格.A conflagration in 1947 reduced 90 percent of...
请保持地方清洁, 并于使用后把所有废物带离中心.Please keep the place clean, and throw away any garbage.椭圆越扁平,两焦点之间的距离越远,每个焦点离中心的距离也越远.The flatter the ellipse the farther apart the foci and the farther each focus the center....
云仙山今天一直在向外喷涌火山灰、气体和火山岩。Mount Unzen has been spewing out volcanic ash, gas, and rock today.他转身不理他们，噔噔噔地爬上了山。He turned his back on them and stomped off up the hill.亚历山德拉穿着那身过时的衣裳，显得臃肿笨拙。Alexandra looked plump and awkward i...