| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide pavement stone inexpensively mass-produced and capable of effectively preventing the propagation of weed. <P>SOLUTION: The germination of the seed of the weed is prevented by firing igneous rock containing calcium to move calcium to the surface and making the pH of water stuck on the surface alkaline by the calcium on the surface. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
