Through the analysis of the stress characteristics of the circular pipe cavity mushroom floor, this paper analyzes the calculating model and method of the floor slab.
通过分析圆管式空心无梁楼盖的受力特点，分析了此楼板体系的计算模型及计算方法。
A novel water pipe, comprising a pipe wall and a tubular body with a pipe cavity, wherein the upper edge of the pipe wall (1) is axially provided with at least one groove (2).
一种新型水管，包括管壁和具有管内腔的管状体，其特征在于，所述的管壁(1)上沿轴向设有至少一条凹陷槽(2)。
If oil got into the production pipe from the bottom, then barriers that would have impeded its flow up the cavity around that pipe would have made little difference.
如果油流从油井底部进入到生产管线内，这个环绕在生产管线外部的阻隔体对阻止油流上升能起多大作用呢，两者的差异将会非常小。
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