Based on tobacco company evaluations of upper-stalk tobacco from these trials, ripeness and separation of the uppermost leaves had the greatest effect on tip grade production.
根据烟草公司对来自从这些试验的上部烟叶的评估，成熟度和最上部叶的分次采收对顶叶等级的产生影响最大。
The craft for separation and recovery of selenium and tellurium from high grade waste material has been put forward based on experiment results.
提出了从高品位硒、碲废料中分离回收硒和碲的工艺。
Study is made on the upgrading of Co from low-grade concentrate calcine leachateand its separation from impurities.
研究了从低品位硫钴精矿焙砂浸出液中钻的富集及其与杂质的分离问题。
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