9. Room: The floor space approximately 130 square meters, the interior selects the height 6 meters, has interlayer, actually uses 130 square meters.
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Production experiment indicates that this kind of drill bit has ideal effect in the middle-hard broken formation and the soft-hard interlayer as well as in the gravel formation.
生产性试验表明，该类型钻头对于钻进硬而破碎地层、软硬夹层以及卵砾石地层均具有很好的使用效果。
Interlayer (16) has a uniform thickness profile extending from edge (18) to point (20) and a wedge-shaped thickness profile from point (20) to edge (22).
中间层(16)从边缘(18)到点(20)具有均匀的厚度分布，并且从点(20)到边缘(22)具有楔形厚度分布。
In rock blasting, the rock interlayer has great influence on the quality and effect of blasting.
在土岩爆破中，夹层的存在对爆破质量和爆破效果有着较大的影响。
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