问题 单项选择题 B型题

用于定量的参数是()

A.色谱峰高或峰面积

B.死时间

C.色谱峰保留时间

D.色谱峰宽

E.色谱基线

答案

参考答案:A

解析:本题考查色谱基本理论。色谱峰高或峰面积可用于定量;死时间:不保留组分(不溶于固定相或不被固定相所吸附)的保留时间;保留时间:由进样到某组分色谱峰峰顶的时间间隔;色谱蜂宽:通过色谱峰两侧的拐点作切线,在基线上的截距,用于衡量柱效;基线:在操作条件下,没有组分流出时的流出曲线,基线反映仪器噪音随时间的变化。

阅读理解

阅读理解。

     It's 5:00 in the morning when the alarm (闹钟) rings in my ears. I roll out of bed and walk

blindly through the dark into the bathroom. I turn on the light and put on my glasses. The house

is still as I walk downstairs while my husband and three kids sleep peacefully. Usually I go for

a long run, but today I choose my favorite exercise DVD,Insanity.Sweat pours down my face

and into my eyes. My heart races as I force my body to finish each movement. As I near the

end of the exercise,I feel extremely tired, but a smile is on my face. It's not a smile because the

DVD is over, but a smile of success from pushing my body to its extreme limit.

   Some people enjoy shopping, smoking, food, work, or even chocolate. But I need exercise

 to get through each day. Some shake heads when they see me run through the town. Others

get hurt when I refuse to try just one bite of their grandmother's chocolate cake. They raise

their eyebrows, surprised by my "no thank you," or by my choice to have a salad. Over the

years, I have learned it's okay to just say "no." I shouldn't feel sorry for refusing food that I

don't want to eat.

     So what drives me to roll out of bed at 5:00 a.m.?What gives me the reason to just say

no to ice cream? Commitment. A commitment to change my life with a way that reduces daily

anxiety,increases selfconfidence and energy,extends life and above all improves my body shape.

This is the point where a smile appears on my face as I look at myself in the mirror or try on my

favorite pair of jeans that now fit just right.It's through commitment and sweat that I can make a

difference within myself inside and out.

1.Why is there a smile on the author's face in the morning?

A.Because she sees her family sleeping peacefully.

B.Because she finishes her favorite exercise.

C.Because she enjoys the interesting DVD.

D.Because she feels a sense of achievement.

2.Which of the following is true according to Paragraph 2?

A.She doesn't treat others politely.

B.She likes to make others surprised.

C.Others don't understand what she does.

D.Others try to help her by offering her food.

3.What does the underlined word "commitment" in the last paragraph mean?

A.Good health.

B.Firm belief.

C.A strong power.

D.A regular habit.

4.What can we learn about the author from the text?

A.She acts in a strange way.

B.She wants to look different from others.

C.She aims to develop a good body shape.

D.She has difficulty getting along with others.

填空题