The central air-conditioner is normally being used in buildings to supply heat and air-condition. There are lots of problems it might happen during th【More...】

As time goes by, bridges are getting old and the maintenance fee is also getting higher and higher. Thus, routine inspection, maintenance and bridge s【More...】

As the population gets higher and higher, the importance of traffic management between human, car and road is getting more and more important.【More...】

With the advance of economy and city size are boosting, high-rise apartments and elevator installation are increasing as well. However, as the elevato【More...】

City common Sewer is a pipeline utility-tunnel that combines more than two pipelines in the tunnel including, electricity, telecommunication, gas, wat【More...】