莱特兄弟在1903年12月17日用一架轻而薄的,单螺旋桨的飞机实现了一系列短距离飞行,从而证明了这并非不可能。
The Wright brothers proved otherwise on December 17th 1903, making a series of short flights in a flimsy, single-propeller plane.
前驱体中有多孔结构、良好的层状结构、特别是非常规则的单螺旋及双螺旋纳米棒,是比较新颖的一种纳米自组装结构。
In precursors, clear layer structures are observed, especially some regular single and double helix nano rod, which are noble self-assemble structure.
本文在综合考虑传热性能和摩擦阻力等因素的基础上,对单螺旋槽套管式冷凝器的结构进行了优化和研究。
On the base of both consideration of heat transfer performance and resistance, the optimization and research are carried out on single spiral duct double pipe condenser.
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