Price of domestic membranes
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That friend from Sichuan is aware of the current prices of domestic membranes as well as their actual usage in practice.
Asking for a price in this way is completely pointless. This falls under the category of purchasing production materials, and it requires formal quotations to be obtained through inquiry processes. Such quotations are related to factors such as the quantity to be purchased, payment terms, delivery deadlines, warranty periods, and scope of services. That is, this is not the way business is conducted in the ordinary market. There may even be different quotes for different users, as the creditworthiness of the users in the eyes of the seller also has a significant impact.