Maintain a "mulch-free" area around the perimeter of the home that it is at least 12" wide and comprised of rock or gravel.
保持一个围绕房屋周边的“无植被覆盖区”,由至少12寸宽的岩石或砾石组成。
2
Expcrimental stress analysis by electrical measuring method was carried on the ring plate with fixed outer perimeter, free inter perimeter and received even load.