【摘 要】
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介绍了一种带切换机构的开花斜楔在汽车顶盖翻边模具中的应用,通过对顶盖的冲压工艺及模具结构的分析,采用一种气动切换机构和开花式的斜楔机构,实现了有天窗和无天窗两种状
The marine sediments of the area of Verde Peninsula-Jabali Island(39°28′S/62°19′W-40°28′S/62°11′W) Holocene in age(3-2 ky),and modern beaches contain a
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目的:探讨放射治疗胸部病变所致损伤的机制和特点,达到及时防治的目的。方法:收集3202例有完整影像学资料的胸部肿瘤病人的放射治疗临床资料,进行分析总结。结果:所有病例胸
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