问题 单项选择题 A1/A2型题

在气相色谱法中,当升高柱温时()

A.分离度提高

B.灵敏度提高

C.保留时间增加

D.保留时间缩短

E.检出限提高

答案

参考答案:D

解析:柱温越高,检测物与固定相吸附越不牢,在柱内流动也越快,保留时间缩短。

单项选择题
阅读理解

阅读理解。

                                                             The Statue of Liberty

                                                                  自由女神铜像

     In the water around New York City is a very small island called Liberty Island. On Liberty Island there

is a very special statue called the Statue of Liberty. It is one of the most famous sights in the world.

      The Statue of Liberty was a gift from the people of France to the people of the United States. The statue

was made by a French sculptor (雕塑家) named Frederic Auguste Bartholdi. 1 The inner support system

was designed by Gustave Eiffel, the same man who made the famous Eiffel Tower in Paris.

     Liberty, of course, means freedom, and the Statue of Liberty was given to the United States to celebrate

the one-hundredth anniversary (周年纪念日) of U.S. independence (独立) from England. The statue was

built in France, taken apart piece by piece, and then rebuilt in the United States. 2 It was opened for the

public on October 28, 1886.

     As you might expect, the statue is very big. Visitors can ride an elevator (电梯) from the ground to the

bottom of the statue. If they want to, they can then walk up the 168 steps to reach the head of the statue

where they can look out and enjoy the beautiful sight (景色) of the city of New York.

Find the words in that are closest in meaning to the words or expressions in Column 1.

Column 1                                                                                            Column 2 

( )1. present                                                                                      A) island

( )2. the state of being free                                                                 B) gift

( )3. a piece of land surrounded by water                                            C) freedom

( )4. be in, and be carried in a bus                                                       D) supoort

( )5. bear the weight of                                                                       E) ride