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。
2
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。
3
Study is made on the upgrading of Co from low-grade concentrate calcine leachateand its separation from impurities.