| 摘要 |
Described is a reflective ground cover sheet material (1) in which longitudinally extending opposite side margins (A) of the sheet material are stronger than a longitudinally extending centre section between the side margins of the material. Also described is a reflective ground cover sheet material (1) having longitudinally extending opposite side margins (A) of the sheet material of lower porosity than a longitudinally extending centre section between the side margins of the material. |
