| 摘要 |
Each module 10 includes sheaths 3 stretched between two holed plates 2. Two superimposed modules 10, 10' have their holed plates 2 arranged in the normal direction in the case of one of them, and rotated through 180 DEG in their plane in the case of the other one so that in the vertical direction each column includes both inlet and outlet sheaths. <IMAGE>
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