Manhole, observationhole and measure hole are set on the wall.
炉墙上设有人孔门、观察孔和测量孔。
2
For the oil level gauge, observationhole and the best use of natural materials, glass or polyamide materials.
用于油位计、观察孔等的材料，好使用天然玻璃或聚酰胺材料。
3
Recognition of aquifer with both unite pump experiment data and long-time observationhole data in numerical model parametric recognition process gets a good effect.