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请下载后查看，本文暂不支持在线获取查看简介。国防科工委副主任、国家宇航局局长栾恩杰给《航天制造技术》编辑部的一封信
Please download to view, this article does not support online access to view profile. Luan Enjie, deputy director of National Defense Commission for Science and Technology and director of NASA, gave a letter to the Editorial Department of “Aerospace Manufacturing Technology”