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【简答题】
George Gershwin, born in 1998, was one of America’s greatest composers. He published his first song when the was eighteen years old. During the next twenty years he wrote more than five hundred songs. Many of Gershwin’s songs were first written for musical plays performed in theatres in New York City. These palys were a popular form of entertainment in the 1920s and 1930s. Many of his songs have remained popular as ever. Over the years they have been sung and played in every possible way — from jazz to country. In the 1920s there was a debate in the United States about jazz music. Could jazz, some people asked, be considered serious music? In 1924 jazz musician and orchestra leader Paul Whiteman decided to organize a special concert to show that jazz was serious music. Gershwin agreed to compose something for the concert before he realized he had just a few weeks to do it. And in that short time, he composed a piece for piano and orchestra which he called Rhapsody in Blue. Gershwin himself played the piano at the concert. The audience were thrilled when they heard his music. It made him world-famous and showed that jazz music could be both serious and popular. In 1928, Gershwin went to Paris. He applied to study composition ( 作曲 )with the well-known musician Nadia Boulanger, but she rejected him. She was afraid that classical study would ruin his jazz-influenced style. While there, Gershwin wrote An American in Paris. When it was first performed, critics ( 评论家 )were divided over the music. Some called it happy and full of life, to others it was silly and boring. But it quickly became popular in Europe and the United States. It sill remains one of his most famous works. George Gershwin died in 1937, just days after doctors learned he had brain cancer. He was only thirty-nine years old. Newspapers all over the world reported his death on their front pages. People mourned the loss of the man and all the music he might have still written.
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【简答题】根据消费习惯,湖南、四川的居民喜欢吃辣,而山西的居民爱吃醋;再比如我国的茶叶市场,南方的居民喜欢红茶和绿茶,华北、华东地区的消费者更喜欢花茶,而少数民族地区的居民则偏爱砖茶。这种划分方法属于( )A. 地理细分 B.人口细分 C.心理细分 D.行为细分
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【单选题】在PowerPoint中,下列不能编辑幻灯片内容的视图方式是__________
A.
幻灯片
B.
幻灯片浏览
C.
幻灯片放映
D.
备注页
【多选题】色谱流出曲线上,可以得到许多重要信息()。
A.
根据色谱峰的个数,可以判断样品中所含组分的最少个数。
B.
根据色谱峰的保留值,进行定性分析。
C.
根据色谱峰的峰面积或峰高,进行定量分析。
D.
色谱峰的保留值及其区域宽度(峰高、峰面积),是评价色谱柱分离效能的依据。
【简答题】如何在javascript中定义一个函数(试写一个函数)?
【多选题】从色谱流出曲线可以得到许多重要信息,包括( )。
A.
根据色谱峰的个数,可以判断试样中所含组分的最少个数
B.
根据色谱峰的保留值,可以对组分进行定性分析
C.
根据色谱峰的面积或峰高,可以对组分进行定量分析
D.
根据色谱峰的保留值及区域宽度,可以评价柱效
E.
根据色谱峰间的距离,可以评价色谱条件的选择是否合理
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A.
人口细分
B.
地理细分
C.
行为细分
D.
心理细分
【单选题】曲柄摇杆机构中()两极限位置时所夹的锐角称为极位夹角。
A.
曲柄
B.
摇杆
C.
连杆
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A.
色谱峰的个数,可推断所含组分的个数
B.
根据色谱峰的保留值,可以进行定性分析
C.
根据色谱峰的面积或峰高,可以进行定量分析
D.
色谱峰两峰间的距离判断组分选择性
【多选题】从色谱图中可获得的信息有( )
A.
根据色谱峰两峰间的距离,可判断分离的好坏
B.
色谱峰的保留值及其区域宽度,可评价柱效
C.
色谱峰的个数,可判断所含组分的最多个数
D.
根据色谱峰的保留值,可以进行定性分析
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