其印刷技术从选材、雕版、印刷，在当时都有无比的优越性。
Its printing technology, including selection, vulture version, and printing, all of which were in inimitable advantage of that period.
从选材角度对比分析了几种铝合金的动态断裂韧性及裂纹扩展阻力。
From the view point of material selection, we analyzed their dynamic fracture toughness and crack propagation resistance.
着重论述了新型氧气缓冲装置的设计过程，尤其是从选材和焊接上进行了优化。
This paper focuses on the oxygen buffer the design process, in particular from the welding material and optimized.
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