| 摘要 |
The matrix material which fills the distance spaces between the tubelets also fills out the tubelet hollow spaces. The matrix material comprises a foam-type mass containing air enclosures. One set of tubelets (1) are axis-parallel to each other, spaced apart, with other tubelets (2) acting as distance holders to them. The matrix materials (3,4) are of unburnable material and the tubelet pieces are of glass
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