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Tea drinking was common in China for nearly one thousand years before anyone in Europe had ever heard about tea. People in Britain were much slower in finding out what tea was like , mainly because tea was very expensive . It could not be bought in shops and even those people who could afford to have it sent from Holland did so only because it was a fashionable curiosity . Some of them were not sure how to use it . They thought it was a vegetable and tried cooking the leaves . Then they served them mixed with butter and salt . They soon discovered their mistake but many people used to spread the used tea leaves on bread and give them to their children as sandwiches . Tea remained scarce and very expensive in England until the ships of the East India Company began to bring it direct from China early in the seventeenth century . During the next few years so much tea came into the country that the price fell and many people could afford to buy it . At the same time people on the Continent were becoming more and more fond of tea . Until then tea had been drunk without milk in it , but one day a famous French lady named Madame de Sevigne decided to see what tea tasted like when milk was added . She found it so pleasant that she would never again drink it without milk . Because she was such a great lady that her friends thought they must copy everything she did ,they also drank their tea with milk in it . Slowly this habit spread until it reached England and today only very few Britons drink tea without milk . At first , tea was usually drunk after dinner in the evening . No one ever thought of drinking tea in the afternoon until a duchess (公爵夫人)found that a cup of tea and a piece of cake at three or four o’clock stopped her getting “a sinking feeling” as she ca lled it . She invited her friends to have this new meal with her and so , tea-time was born .
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【简答题】基于下述方框图,设计一乘除法混合电路,并给出仿真电路。
【单选题】沃尔玛的持续补货系统是以下哪个模型的样例?
A.
推动模型
B.
拉动
C.
基于企业式
D.
供应链优化
E.
基于预测
【判断题】液相色谱中,固定相的极性比流动相的极性强时,称为正相液相色谱。
A.
正确
B.
错误
【单选题】正相色谱中,固定相与流动相的极性大小比较为
A.
固定相>流动相
B.
固定相
C.
极性稍有差别
D.
其它
【多选题】与推动式供应链模式相比,拉动式供应链模式的优势表现在( )。
A.
能够全面衡量业绩,更易于实施控制
B.
支持产品的不断变化
C.
提高经营效率
D.
改进质量,降低单位成本
E.
缩短交货周期
【简答题】高效液相色谱法中,最常用的反相柱为___柱,又称为___柱,反相色谱中固定相极性比流动相极性___。
【判断题】液相色谱中,固定相的极性比流动相的极性强时,称为正相液相色谱
A.
正确
B.
错误
【单选题】下列关于正相色谱与反相色谱说法正确的是( )。
A.
正相色谱是指固定相的极性低于流动相的极性
B.
正相色谱色谱过程中非极性分子或极性小的分子比极性大的分子移动的速度慢
C.
反相色谱是指固定相的极性低于流动相的极性
D.
反相色谱色谱过程中,极性大的分子比极性小的分子移动的速度慢
【单选题】正相色谱中,流动相极性比固定相( )
A.
B.
C.
相同
D.
不确定
【判断题】员工培训的内容主要包括职业技能和文化知识。
A.
正确
B.
错误
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