文章从铸铁的化学成分、微量元素、孕育处理及金属型的热交换方面叙述了产生白口的原理及防白口的有效方法。
From the chemical composition, trace element, inoculation and thermal exchange of metal mold casting, the principle of chill formation and the effective methods for preventing chill were studied.
李洱小说的叙述艺术体现了一个学者型作家的叙述智慧。
The narrative art of Li ers novels embody an author relating wisdom.
本文叙述了混合合型大电流光纤传感器的工作原理及制作方法。
In this paper, the working principles and fabricating methods of hybrid large current fiber sensor have been described.
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