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中医药文化是中国文化宝库中的瑰宝。从龙脑樟树中提取的龙脑具有极高药用价值和保健功能。《神方》记载:“之头脑疼痛,龙脑一钱,纸卷做拈,烧烟熏鼻,吐出痰涎即愈。”唐代医药典籍称龙脑“为百药之先,万物中香无出其右者”。 不知从何时起,龙脑樟树在我国“销声匿迹”了,我国所需龙脑不得不长期依赖进口。 1988 年我国发现了一颗野生龙脑樟树! 科研人员以此为契机创立了专业研发中心和实验室,他们深入研究中药典籍中有脑的资料,利用现当代科技成功培育了脑樟树原料体,改变了原料生产完全依赖自然的状况;研制了我国第一套天然龙脑工业化提取成套设备,改进了创痛龙脑提取方法,来发了新产品;建立了中国第一个龙脑樟资源基因库,积累并保存了大量珍贵的数据;通过电视,网络等着力打造中医药文化品牌。 ( 1 )结合材料,运用辩证否定观分析为什么科研人员能够成功开发龙脑。
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【单选题】Section DDirections: Read the following text about the young generation’s performance in their jobs. For questions 41-45, choose the answer (A, B, C or D) which you think fits best according to the te...
A.
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B.
Young men are superior to older ones.
C.
Young men get better jobs than older ones.
D.
Young men always fail to complete their tasks.
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A.
she has given
B.
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C.
she gave
D.
has she given
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【单选题】常用尺寸段的标准公差值,随公称尺寸的增大而增大,随公差等级的提高而______。
A.
增大
B.
减小
C.
增大或减小
D.
保持不变
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B.
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C.
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D.
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