对疏散星团质量分层的有关问题做了简要的评述，包括空间质量分层和速度质量分层的表现形式和探测途径，质量分层形成机制的研究现状。
The mass segregation effects of open clusters, including spatial mass segregation and velocity mass segregation, are of great importance for studies of formation and evolution of clusters.
介绍了质量体系文件分层和编号的原则和方法。
Introduces the principle and method of quality system files layering and numbering.
并结合工程实际介绍了分层分块设计、混凝土温控、施工质量控制、增设温度筋和抗裂筋等技术措施。
In addition, spiral case design method by layers and blocks, concrete temperature control, construction quality control, additional anti-crack reinforcement bar disposal, etc.
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