本文刻划了包含投射模的几乎可裂序列，给出以投射模为首项和中间项的几乎可裂序列的特性。
We describe the properties of the almost split sequence containing projective module as the first term and the middle term.
本文运用电子扫描、金相分析、硬度测量等方法对气门阀热镦模的早裂进行了失效分析，探讨了模具的失效机理，提出了改善模具质量、提高模具使用寿命的途径。
In this paper, the failure of hot-work valve die is analysed with SEM, optical microscope and hardometer. The crack mechanism is explained and some methods are presented to prolong the die-durability.
前言： 针对EPS 陶瓷壳型精铸失模时容易裂壳的现象，对EPS消失模精密铸造工艺进行了研究。
Respecting the cracking phenomenon of ceramic shell, the pattern removing technique of EPS mold was investigated.
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