According to Zhang doctors, decorative stones can release the material a radon, radon is a colourless radioactive gas, is the concrete construction materials containing granite released.

 
  • 据张医生介绍,装饰材料中的石材可释放出一种氡气,氡气是一种无色无味的放射性气体,是含花岗石的混凝土建筑物料释放出来的。
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