Installing solar panels. How to do it? alternative energy sources have a number of advantages. Solar panels are safe, effective, and very convenient. These panels generate electricity all year round. There are both compact and large in size models of solar panels. Monocrystalline solar cells are silicon cells, combined with each other. For their
How is this done? Construction of bridges. classification of bridges and types of span structures. Span structures are distinguished constructively, according to the design scheme of the facility and the material of manufacture. For each specific case, a certain type is selected, taking into account the terms of reference and the existing conditions.