Where do the samples for testing Chinese medicinal materials that pass No. 3 sieve come from without special regulations?

The new 2015 version of "Chinese Pharmacopoeia".

According to Shanghai Chuanlang Environmental Protection Technology Co., Ltd., the current version of the "Chinese Pharmacopoeia" is the 2015 edition, and the powder grade and sieve number are specified in the general section.

Powders are graded as follows.

1. The coarsest powder: refers to the powder that can all pass through the No. 1 sieve, but is mixed with no more than 20% of the powder that can pass through the No. 3 sieve.

2. Coarse powder: refers to the powder that can pass through the No. 2 sieve, but is mixed with no more than 40% of the powder that can pass through the No. 4 sieve.

3. Medium powder: refers to the powder that can all pass through the No. 4 sieve, but is mixed with no more than 60% of the powder that can pass through the No. 5 sieve.

4. Fine powder: refers to powder that can pass through the No. 5 sieve and contains no less than 95% of the powder that can pass through the No. 6 sieve.

5. The finest powder: refers to the powder that can all pass through the No. 6 sieve and contains no less than 95% of the powder that can pass through the No. 7 sieve.

6. Ultra-fine powder: refers to powder that can completely pass through the No. 8 sieve and contains no less than 95% of the powder that can pass through the No. 9 sieve.