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.
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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