4. Which of the followings is the volume-surface means diameter of a mixture of particles?
(A) 615b9e0376cb1.jpg
(B)615b9e2b32c39.jpg
(C)615b9e49c41c1.jpg
(D)615b9e742b6b1.jpg 
xi: mass fraction in a given increment; N: number of particles in a fraction; NT: total particle number; 615b9ebbe76b4.jpg: average particle diameter in an increment

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