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An automobile body is a sheet metal shell with Windows, doors, a hood, and a trunk deck built into it.
汽车车身是由金属薄片壳、车窗、车门、发动机罩和行李舱盖等共同构成。
According to the sine law, vertical wall shell cannot be finished at one time in nc incremental sheet metal forming process, it must be formed at many times.
根据正弦定律，金属板料数控渐进成形工艺，不能一次成形出直壁筒形件，要成形直壁筒形件，必须进行多次成形。
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