本文结合顾桥煤矿主井冻结段的冻结工程与凿井工程施工的成功经验，探讨了深厚冲积层冻结法凿井安全快速施工的几个问题。
Combining to the freezing and digging engineering in main shaft of Guqiao mine, the paper studied some problems for safety and fast construction in deep freezing alluvium.
本文对80例特大交通事故伤亡作一回顾性分析研究。
This article is about the reviewing analysis and study in the injuries and deaths by 80 serious traffic accidents.
近年来在弧面凸轮机构研究领域出现了许多新思想和新方法，本文对近期这一领域的研究成果作一回顾，并对有关资料作一整理，指出今后应该研究的重点方向。
Recently, there has been a lot of new theories and methods in the area. The author reviews these studies, collects some data and points out the important study directions.
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