(多选题, 5.6分)What can we learn from the case?
选项：

A: Don't use sale by sample and by description together to indicate the quality of goods .
B: As to agricultural products such as ginseng, cannabis and so on, it is advisable to illustrate the quality of goods by scientific indicators rather than sale by sample.
C: Originally, the delivered goods are up to standard, the later requirment that the quality should be equal to the sample was telephoned to the buyer after contracting, which shall not be treated as contract terms, so the buyer could not claim for the reason that the deal was not conducted based on sale by sample.
D: If we can use one method to indicate the quality of goods, we do not adopt two.