Postage machine stamp of Chenzhou Mining Expo
Publish: 2021-04-25 04:59:45
1. For example, the national inspection and appraisal institutions of the University of Geosciences and Peking University send them to the appraisal center before 2 o'clock on the same day, and the certificates can be obtained on the same day; Some appraisal institutions, such as NGTC, will take a long time, 2-3 days.
2. Unknown_Error
3. Strictly speaking, I can't finish learning all my life
if it's just to avoid being cheated. Then two or three years is about the same.
if it's just to avoid being cheated. Then two or three years is about the same.
4. It looks like ore. in addition, if it's magnetic, you should use a magnet to absorb it to judge, rather than using it to absorb iron objects. Generally, these ores are not very pure magnetite, and their magnetism is not very strong
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