Standard sample meaning: standard sample is referred to as standard sample or physical standard. It is developed according to the need of implementing and formulating the character standard. As a supplement to the character standard, the material is a kind of standard material agent of the Institute of Chinese Medicine standards.

Reference sample meaning: In international trade, if the seller provides the sample to the buyer only as a reference for negotiation, the reference sample is different from the nature of the transaction sample and should not be used as a formal basis for inspection.

The standard sample has two characteristics:

1, with enough uniformity. Please note that it is not very uniform but uniform enough. Because it is only to ensure the consistency of the application effect of technical standards in different space applications, that is, to meet the requirements of the technical indicators in the text standard.

2. It's well established. Please note that this does not mean very accurate but very certain, that is, the standard value is required to be reliable. It is not required to be very accurate, only that it should meet the technical indicators in the text standard.

The above content is the introduction of the meaning of standard samples and reference samples respectively, reference samples refer to the seller and the buyer in order to develop trade relations with each other and send each other, only for each other to understand the goods, not as a quality basis for transaction or delivery. The reference sample must be marked "for reference only" when sent to avoid confusion with the standard sample. This sample is not binding on either party.