在气相色谱法中,定性指标有()。 A.保留时间 B.峰高 C.峰面积 D.保留体积

题型:单项选择题 A1/A2型题

问题:

在气相色谱法中,定性指标有()。

A.保留时间

B.峰高

C.峰面积

D.保留体积

E.调整保留体积

考点:理化检验技术(士)专业知识专业知识题库
题型:单项选择题 A1/A2型题

Thursday is ____________ day of a week.[ ]

A. fifth

B. the fifth

题型:单项选择题 A1/A2型题

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余项。

5 Things to Do in a Traffic Jam

Tired of traffic jams? Here are some tips that can help you to calm down in a traffic jam.

Listen to a CD audio book

It’s a good idea to keep several audio books in your car.    小题1:   Listening to an exciting story is more interesting than sitting silently and being bored.

Sing loudly

If you begin getting angry because of a long traffic jam, turn your CD player on or radio    up.  小题2:  Imagine you’re a wonderful singer and the audience is listening to you in admiration. Your stress will disappear.

  小题3:  

You can use the radio and play entertaining games while waiting. For example you can   guess the song or the singer or to see how quickly you can recognize a new song.

Have a snack(零食)

Keeping a tasty snack in the car is especially good for waiting in traffic jams. Choose what you like most of all, so you will look forward to traffic jams to have a chance to eat the delicious snack.   小题4:   In that case, time is the last thing to worry about.

Argue with the radio talk show host

Find a station with a radio talk show.   小题5: If you disagree, you can show your anger. Don’t be afraid to call their ideas stupid. Only make sure that the car windows are closed so no one may hear you.

Sitting in a traffic jam can be very stressful but next time you can use these simple tips, and you won’t notice how long you have been waiting and soon you will be on your way.

A.Play games

B.Use the radio.

C.Enjoy every bite of it.

D.Listen to their debates carefully.E. Loud singing can help to reduce stress.

F. Begin to enjoy them as quickly as you can.

G. The storyteller’s voice can clear all your bad emotions.

题型:单项选择题 A1/A2型题

当客户需要产品时,企业具有可向客户提供足够产品的库存能力称为()。

A.供需的动态性

B.产品的可得性

C.送达的快速性

D.服务的可靠性

题型:单项选择题 A1/A2型题

新课程课堂教学评价的基本理念包括:()

A.以升学考试作为衡量教学成果的唯一依据

B.促进学生发展

C.促进教师成长

D.以学论教

题型:单项选择题 A1/A2型题

短心轴给工件内孔定位,可限制()个自由度。

A.2

B.3

C.4

D.5

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