里程表 发表于 2025-3-21 16:20:47
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Ke Xu,Haitao Liu,Xingqiao Zhu,Yongbin Songe observations relevant to a current need. Examples of each are the transistor, the electric light bulb, the Bessemer converter and the Mannesmann tube-piercing method. In the case of the electric light bulb the design concept came first, derived from logical use of scientific principles, followed b柔软 发表于 2025-3-22 09:18:02
Matteo Russo,Elie Gautreau,Med Amine Laribia problem tend towards safety and which towards danger of failure. The trouble starts when attempting to give it a numerical value. In design practice there is no single value for assessing safety margins, as can be seen from the examples below.毕业典礼 发表于 2025-3-22 16:07:54
Mingyang Wang,Shuwen Li,Yuehai Sunride it. How is intrinsic stability obtained? There is a popular notion that the head angle confers stability, yet early bicycles had upright steering heads. A little thought shows that sloping heads actually tend to de-stabilise. Under gravity the load and earth try to come together. Relative to th文件夹 发表于 2025-3-22 20:44:02
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Taiki Suwa,Daisuke Matsuura,Tsune Kobayashise; to call for materials new to the maker can produce problems of supply, identification, treatment and storage. So whenever possible the designer should check up on this point and possibly change one or the other, material or maker.羽饰 发表于 2025-3-23 02:15:33
https://doi.org/10.1007/978-3-031-45709-8e usually with an electric arc. The workpiece usually forms one of the electrodes; the other is guided by the welder and is either of tungsten, which is not intended to melt, or of filler material which forms part of the joint. Other methods use local heating within the joint region, sometimes combi允许 发表于 2025-3-23 09:00:15
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