The sampling of OQC samples should meet the principle of random and stratified sampling; the number of boxes for sampling should account for more than 30% of the number of boxes sent in the batch.
OQC sample extraction needs to meet the principle of random, layered sampling, and the number of sampling boxes should account for more than 30% of the number of batch boxes sent.
OQC sampling should meet the principle of random and stratified sampling, and the number of sampling boxes should account for more than 30% of the number of boxes sent to the batch.<br>