但碲在富钻结壳、海底多金属结核、深海沉积物和陨石中的丰度异常高。
However, tellurium contents are extremely high in Co-rich crusts, Marine polymetallic nodules, deep-sea sediments and aerolites.
选用加工成本更低，生产效率更高的钻铣机床，获得一种操作简单实用、生产效率高、加工成本低的薄壳类零件槽孔加工工艺。
We can get a simple and utility process technology of slot in thin shell accessory, which is more efficient and low cost. T…
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