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【单选题】
煤粉细度R90=8%，其意义是A.
煤粉通过筛边长为90微米的筛子时，停留在筛子上（即筛上）的煤粉百分比为8%。
B.
煤粉通过筛边长为90微米的筛子时，通过筛子（及筛下）的煤粉百分比为8% 。
C.
煤粉通过筛边长为90微米的筛子时，有8%的概率全部通过筛子。
D.
煤粉通过筛边长为90微米的筛子时，有8%的概率全部通不过筛子。
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举一反三
【单选题】已知在 CaF 2 ( K sp = 5.3 × 10 - 9 ) 与 CaSO 4 ( K sp = 9.1 × 10 - 6 ) 混合物的饱和溶液中, c (F - ) = 1.8 × 10 - 3 mol × L - 1 则 CaSO 4 的溶解度为 mol × L - 1 。
A.
3.0 × 10 -3
B.
5.7 × 10 -3
C.
1.6 × 10 -3
D.
9.0 × 10 -4
【简答题】短路全电流为____和____之和。
【单选题】已知CaF 2 的K sp = 5.3×10 -9 ,在氟离子浓度为3.0 的溶液中Ca 2+ 可能的最高浓度为( )
A.
1.8×10 -9
B.
1.8×10 -10
C.
5.9×10 -9
D.
5.9×10 -10
【单选题】Which of the following is the way that a computer does its processing?
A.
Recognition and computation separately.
B.
Recognition and computation at the same time.
C.
Computation followed by checking.
D.
Recognition, reasoning and then computation.
【单选题】Which of he following is the way that a computer does its processing?
A.
Recognition and computation separately.
B.
Recognition and computation simultaneously.
C.
Computation followed by checking.
D.
Recognition, reasoning and then computation.
【单选题】Which of the following is the way that a computer does its processing?
A.
Recognition and computation separately.
B.
Recognition and computation simultaneously.
C.
Computation followed by checking.
D.
Recognition, reasoning and then computation.
【简答题】短路全电流分为周期分量和(__)之和
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