單項(xiàng)選擇題不對(duì)采樣有無(wú)系統(tǒng)誤差產(chǎn)生影響的是()

A.采樣工具;
B.采樣點(diǎn)的定位;
C.子樣數(shù)


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2.單項(xiàng)選擇題對(duì)1440t原煤在皮帶上采樣,應(yīng)采子樣數(shù)為(Aa=28%)()

A.72個(gè);
B.144個(gè);
C.36個(gè);
D.288個(gè)

3.單項(xiàng)選擇題對(duì)1440t原煤在皮帶上采樣,應(yīng)采子樣數(shù)為(Aa=18%)()

A.72個(gè);
B.144個(gè);
C.36個(gè);
D.18個(gè)

4.單項(xiàng)選擇題對(duì)1440t原煤煤堆,應(yīng)采子樣數(shù)為()

A.144個(gè);
B.72個(gè);
C.36個(gè);
D.60個(gè)

5.單項(xiàng)選擇題汽車(chē)上采煤樣,應(yīng)下挖深度為()

A.0.2m;
B.0.3m;
C.0.4m;
D.0.5m