自一九九九年开始，加拿大使馆通过文件筛选（Paper Screening）方式，挑选部分申请人参加国际英语测试制度（IELTS-雅思）考试，考试合格者有较大机会免面谈。
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waste paper screening 废纸处理
In the paper, screening of nutritional yeast parent strains, mutation of rich riboflavin strain, shake-flashing culture conditions as well as fermentation technology of nutritional yeast were studied.
本论文针对营养酵母出发菌株的筛选，高核黄素含量菌株的诱变育种及营养酵母摇瓶培养条件、生产工艺进行了研究。
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