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前言毛主席教导我们:“中国人民有志气,有能力,一定要在不远的将来,赶上和超过世界先进水平。”随着现代科学技术的发展,对于特殊材料的使用量与品种大大增
Foreword Chairman Mao has taught us: “The Chinese people have the ambition and the ability to compete with and surpass the world’s advanced level in the near future.” With the development of modern science and technology, the use of special materials and varieties have increased significantly.