What is the practice of external wall insulation? What is the main thing?
Look at the past year Zhenti meaning little, the book of the whole question to clear the OK.
From the interface of the connection, the flexible interface cast iron drainage pipe can be divided into no W-type (commonly known as clamp type), flange mechanical type A, (double) flange mechanical type B, flexible socket type four Species
When the use of bamboo scaffolding scaffolding, the vertical horizontal bar should be fixed at right angles to the horizontal horizontal bar, and should be equidistant set, the spacing should not be greater than 400mm
