ventilation section

In this paper, a new design on ventilation pipeline dust cleaning robot was introduced, which was developed at Donghua University based on an invention patent on robot's walking mechanism in non-constant diameter and section-variable pipeline.

东华大学在原有一项发明专利基础上进行二次开发，发明了一种新型非等径、变截面管道机器人行走机构，并将此发明技术成功应用于通风除尘管道清洗机器人开发。

When nucleolar crisp, white section, divide easily cracked, they can buy freeze-drying ventilation Department collections.

当核仁变脆 、 断面洁白, 隔膜易碎裂时, 即可置冷冻干燥通风处收藏.

The sizes of section are related to the drivage costs, maintenance costs and ventilation electric costs.

井巷断面大小直接关系到掘进费 、 维护费和通风电费.