The main difference between the ecological building materials and other new building materials is that ecological building materials are a system engineering concept, and can not only look at a certain link in the production or use process. The evaluation of the material environment coordination depends on the interval or boundary set. At present, the finishing touches at home and abroad are the emergence of various new types of building materials called ecological building materials, such as “ecological cement†produced from waste or municipal waste. However, if there is no system engineering point of view, the design and production of building materials may reflect "green" in one aspect and "black" in other aspects, and the evaluation is inevitably biased or even misleading.
The hole saw, also known as the hole saw or hole saw, refers to a special circular saw in the processing of circular holes in modern industry or engineering. It is simple and flexible to operate, convenient to carry, safe and widely used. The hole opener (cutter) is installed on the ordinary electric drill, and it is convenient to cut round holes, square holes, triangular holes, straight lines and curves on the plane and sphere of various plates such as copper, iron, stainless steel and plexiglass.
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