單項選擇題GB/T176-2008粉煤灰燒失量樣品準(zhǔn)備中采用四分法或縮分器將試樣縮分至多少克,用篩孔為多少的方孔篩篩析?()
A.100g和80μm
B.50g和45μm
C.100g和45μm
D.80g和80μm
A.100g和80μm
B.50g和45μm
C.100g和45μm
D.80g和80μm