| 摘要 |
According to the invention, the bulbs are placed into seats (6) in a felt made of hydrophilic rock wool (5), said seats being spaced regularly and being open on only one side of the felt, where the opening of the seats is slightly smaller than the bulbs (3), and the seats are sufficiently deep so that, when the bulbs (3) are placed in position, they penetrate the seat at least to the level of their maximum cross-section. …<IMAGE>… |
