On behalf of the fifth grade distribution in the narrow vision and HK8 HK4 pistol etc.. Lying below grade three and grade four. Afternoon class is 5,73m minimum thickness (see HK4 pistol) and afternoon class is thickest 12,0m (see HK8), average thick bottom height 7,8m. Changed from grade 5 41,95m (HK4 pistol) - to - 39,06m (HK8). Is the main component of gravel layer, gravel, dust, gray and black, gray brown, its rusty, tight state. Experiments were carried out in the classroom, take samples and 4 points, the index in the 2.3-4 composite board.
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