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[单选题]
计算各筛分计筛余量及筛底存量的总和与筛分前试样的干燥总质量之差,作为筛分时的损耗,并计算损耗率,若损耗率大于(),应重新进行试验
A.0.03g
B.0.3g
C.0.03%
D.0.3%
E.3%
查看答案
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A.0.03g
B.0.3g
C.0.03%
D.0.3%
E.3%
A.试验筛为方孔筛
B.筛分时样品一定要在烘箱里烘干
C.当筛余试样颗粒粒径比公称粒径大于20mm时可以用手拨动颗粒
D.分计筛余计算精确至0.1%,累计筛余计算精确至1%
次数 | 1 | 2 | ||||
筛孔尺寸(mm) | 筛余量(g) | 分计筛余(%) | 累计筛余(%) | 筛余量(g) | 分计筛余(%) | 累计筛余(%) |
5.00 | 12 | 12 | ||||
2.50 | 59 | 63 | ||||
1.25 | 54 | 57 | ||||
0.630 | 45 | 40 | ||||
0.315 | 175 | 178 | ||||
0.160 | 140 | 132 | ||||
0.080 | 0 | 3 | ||||
筛底 | 13 | 15 | ||||
合计 |