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I guess it's the location of the floor drain and the sewer.
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You have to send in the drawings to know what you're talking about!
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The entrance to the hole is the door, and the handle should be.
The diameter is a hole of 50 mm.
Find the size of the bathroom floor beam on the drawing, and the floor beam will be marked on the foundation plan. >>>More
This should be the net area of the buckle wall of the bathroom. >>>More
The shutter door is 80 cm wide and meters high.
There are shutters in the lower part of the door. >>>More
The general description of the water supply and drainage construction drawings has a table of water supply and drainage materials and sanitary equipment, and the quality level requirements are specified in the remarks of the squatting toilet column.