510-83 How are the samples with particle size smaller than 75 um specified in the second sieving method of the 2015 edition of the Chinese pharmacopoeia?

In the second sieving method of 2015 edition of the Chinese pharmacopoeia, it is stipulated as follows for samples with particle size smaller than 75 um:

Air jet sieving method and other suitable methods are suitable for the determination of samples with particle size smaller than 75 um.

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