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There is no clear rule, it depends on the size of the tree species, the growth of the root system and other factors.
It seems that the floor made of non-coniferous wood is 10%. >>>More
Area requirements: In principle, the area of food processing operation and storage sites shall not be less than 300 square meters, depending on the large amount of food supplied by the enterprise itself. For specific requirements, please refer to: >>>More
On the day of the winter solstice, which is the day with the shortest amount of sunshine, as long as you have a window in your home to shine sunlight for more than an hour, you are qualified.
a. At present, there are generally two kinds of qualified parquet in China: one is E0 level, that is, the formaldehyde content should be less than milligramsThe second is E1 level, which requires that the formaldehyde content must be less than milligram square meters. At present, the top ten famous brands on the market are generally sold in E1 products, and the detection value of formaldehyde in the product is about milligram square meters. >>>More
The Ministry of Construction of the People's Republic of China does not have clear regulations on the size of the kitchen area of a building. >>>More