The second is to combine the gypsum filling or stone masonry in the mining area affecting the structures and villages to strengthen the top support to prevent the mining area from falling.
The third is to use a gypsum filling 10m isolation belt to completely separate the mining area from the existing mining area when mining a single layer of gypsum ore body.
The fourth is to manually force the topping in all stages of the mining area according to different conditions.
The fifth is to stipulate that in the future, gypsum mining must adopt reversed staged mining, implement the pillar-type caving mining method, and leave no new mining areas, thus completely eliminating the major hidden danger of the mining area.
The sixth is to reform mining methods. That is to say, the current "empty field method (natural support method) room column type" is changed to "the layered roof type roof lag caving method" or the "layered room column type roof lag caving method". Prevent accidents caused by large roof collapse in the roof.
Bulk of varicella vaccine,semi-finished products.It has good safety with low ratio in adverse reaction. And it has been exported to Bangladesh.
In 2008, BCHT successfully launched its product Varicella Vaccine, Live in China. In the following years, BCHT continuously committed to improving the product and led in 2010 removal of gelatin from adjuvant and extended the vaccine shelf-life up to 36 months which is the longest one in the world in 2011. And it has the following qualities.
Rabies Vaccine,Freeze-Dried Rabies Vaccine,Mild Rabies Vaccine,Stable Rabies Vaccine For Human Use
Changchun BCHT Biotechnology Co. , https://www.ccbcht.net