在气相色谱法中,火焰离子化检测器通常采用的气体有() A.空气 B.氧气 C.氢气

题型:单项选择题 A1/A2型题

问题:

在气相色谱法中,火焰离子化检测器通常采用的气体有()

A.空气

B.氧气

C.氢气

D.氮气

E.氩气

考点:理化检验技术(主管技师)相关专业知识相关专业知识题库
题型:单项选择题 A1/A2型题

阅读理解。根据短文内容判断正(T)误(F)。

  How long can I keep borrowed material?

  Each time you borrow a book or a video, a date due card will be put in the

book or video pocket, telling the day you should return the items to the library.

  Check this date carefully.

  Some items such as Hot Video and Hot Book can be kept for one week with

no renewals.

  You can keep most other items for three weeks, with two renewals allowed

only if there are no holds or bookings on them.

  How can I renew books?

  You can renew items 3 ways:

  1. Call the service line at 21226274444.

  2. Renew the items yourself on the Internet. Items can be renewed twice if

there are no holds on them.

  3. Being the item(s) to any branch and take to the Circulation Desk. Most

materials except Hot Book and Hot Video copies may be renewed twice for the

same period as the original loan, unless another reader has placed a "hold" on

the item. You cannot renew the item if it is overdue.

( ) 1. If you borrow a book from the library, you can always find in the

book a card that tells you when you should return it to the library.

( ) 2. You can keep any items from the library for three weeks.

( ) 3. If another reader wants the item and has placed a "hold" on it, you have

to return it.

( ) 4. Readers can renew every item in the library twice if no one has placed a

hold" on it.

( ) 5. It is easy to renew a book.

New words:

material 材料       date due card 借阅日期卡       renewals 续借

original loan     初次借阅           Circulation Desk 流通部          overdue 预期的

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A.存款保险制度起始于20世纪30年代大萧条之后的美国 

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我的电脑和()是用于文件和文件夹管理的两个应用程序,利用它们可以显示文件夹的结构和文件的详细信息。

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