排序方式: 共有112条查询结果,搜索用时 312 毫秒
61.
2.5TCI柴油豪华配置特拉卡、2.9CRDI柴油四驱特拉卡和一款3.5L汽油豪华装饰车在6月份的北京国际车展将同时亮相。 相似文献
62.
63.
64.
刚刚结束的上海车展给人回味最多的就是SUV(运动型多功能车)的大比拼。SUV在此次上海车展上的一大亮点不仅是福特、三菱、克莱斯勒等老牌公司都推出新车型.而且沃尔沃、现代、双龙等还推出几款概念车.注重操控与舒适结合成为SUV发展的一个流行趋势。 相似文献
65.
桥形蝶鞍并高泌乳素血症1例报告(第一附属医院内科姚孝礼,刘娟,朱英英)引起高泌乳素血症的原因很多,但未曾见到高泌乳素血症与桥形蝶鞍并存的报道。现将我院收治的1例报告如下:患者,女,23岁,农民,以月经稀少6年住院。6年前初潮,持续3天,量少,以后每年... 相似文献
66.
67.
68.
本文对使用加气混凝土砌块施工中较常出现的问题进行了详细分析,并针对这些问题提出了一些解决问题的建议。 相似文献
69.
成立于1967年的现代汽车集团,目前已经成为全球最大的20家汽车企业之一,2003年,现代汽车总产量达到294万台,在世界上排到第七位。2004年初,现代汽车以其卓越的表现被汽车新闻(Automotive News)评为为 相似文献
70.
In the exploitation of ocean oil and gas, many offshore structures may be damaged due to the severe environment, so an effective method of diagnosing structural damage is urgently needed to locate the damage and evaluate its severity. Genetic algorithms have become some of the most important global optimization tools and been widely used in many fields in recent years because of their simple operation and strong robustness. Based on the natural frequencies and mode shapes of the structure, the damage diagnosis of a jacket offshore platform is attributed to an optimization problem and studied by using a genetic algorithm. According to the principle that the structural stiffness of a certain direction can be greatly affected only when the brace bar in the corresponding direction is damaged, an improved objective function was proposed in this paper targeting measurement noise and the characteristics of modal identification for offshore platforms. This function can be used as fitness function of a genetic algorithm, and both numerical simulation and physical model test results show that the improved method may locate the structural damage and evaluate the severity of a jacket offshore platform satisfactorily while improving the robustness of evolutionary searching and the reliability of damage diagnosis. 相似文献