And the main kind of them is the structural bed, which consists of litho group, litho formation and litho member in the classification system.
构造岩层是其中主要类别，其单位等级体制可划分为岩群、岩组与岩段。
Now lathe bed lacks effective design of rational basis; structural design bed is not enough reasonable.
目前对普通车床床身的设计缺乏有效的理论依据，床身的结构设计不尽合理。
The principle, structural characteristic of floatation bed ion exchange reactor and the regeneration status of resin are introduced.
介绍了浮动床离子交换器的原理、结构特点和树脂再生情况。
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