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By the multiple objective optimization, the diffusion angle of the ventilator volutes with high efficiency, low noise and high total pressure of the ventilators was calculated and selected according to the experimental data.
中文意思:
摘要根据实验数据,采用多目标最优化的方法,对效率高、噪声小、全压大等性能指标皆好的通风机蜗壳扩压角进行了理论计算选择。


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By the middle of the 21st century, 5 trillion people will be living in cities.这是说﹐到那时候﹐”住在城市的人将有50亿人“。这是光算活的﹐搬到乡下的不算﹐归西的城市人也不算。
By the middle of the 21st century, 5 trillion people will have lived in cities.这是说﹐到那时候﹐”住在城市的人将有50亿人“。这是光算活的﹐搬到乡下的不算﹐归西的城市人也不算。
By the middle of the eighth century A.D., Tang power had ebbed.公元8世纪中期,唐朝势力开始衰落。
By the middle of the twentieth century, painters and sculptors in the United States had begun to exert a great worldwide influence over art.到了二十一世纪中叶,美国画家和雕塑家开始在世界范围内对艺术产生重大影响。
By the morning of April 4 the situation on the US-Iraqi front showed a tendency toward stabilization.到4月4日晨,美--伊战线的形势显示了趋于稳定的趋势。
By the multiple objective optimization, the diffusion angle of the ventilator volutes with high efficiency, low noise and high total pressure of the ventilators was calculated and selected according to the experimental data.摘要根据实验数据,采用多目标最优化的方法,对效率高、噪声小、全压大等性能指标皆好的通风机蜗壳扩压角进行了理论计算选择。
By the net-shape forming technology, metal sheet is used as a blank, the cylindrical cup is produced through blanking, deep drawing, and etc, and then the cup is clamped to a mandrel rotated together with the main spindle, the pulley is finally produced b钣制带轮是以金属板料为毛坯,经过落料、拉深等冲压工序制成圆筒状,然后将其装夹在带有顶压座的芯模上,使其随主轴一起旋转,通过若干不同齿形的旋压成形轮分别沿径向施加压力而成形。
By the next morning, your horse has become a unicorn with two humps. With creative people, instructing is not good enough. You need to inspire.在设计中,不要满足与你对所有美学和细节的说明。费点时间说明游戏应该传达的感觉,每个部分后面应该表达的目标。以及所有你能描述的,游戏的各方面的精神。
By the next year Mother's Day was also celebrated in Philadelphia.到第二年,费城也开始庆祝母亲节。
By the next year, 1908, Mother's Day was also celebrated in Philadelphia.到了第二年,即1908年,费城也开始庆祝母亲节。
By the ninth century there was a statue of Kuan Yin in every Buddhist monastery in China.到九世纪中国每一个佛教修道院里都有观音的塑像。
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