observatory
发表于 2025-3-30 09:33:50
Binders,polymer.”) In many cases the green ceramic body has to be machined, inspected, stored, and placed onto setters for firing, often by workers who are not perfectly careful, so considerable strength would then have to be provided by the binder.
广口瓶
发表于 2025-3-30 13:49:50
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