汽车钣金变形应用什么力学分析

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• 英语翻译the invention of the camera goes far into the past.In the1500s,men were experimenting with cameras that made images.But it was not until the early1800s that man found a way to make the pictures permanent,Even then,photography was a new field.most families had their pictures taken by a photography.peopel did not own cameras because taking pictures and developing the film were too difficult.In1884,George Eastman changed photography by inventing a ki