可表达HLAⅠ类分子的无核细胞是 A.成熟红细胞 B.淋巴细胞 C.血小板 D.胸腺

题型:单项选择题

问题:

可表达HLAⅠ类分子的无核细胞是

A.成熟红细胞
B.淋巴细胞
C.血小板
D.胸腺上皮细胞
E.树突状细胞

考点:临床执业医师临床执业医师
题型:单项选择题
已知函数f(x)=
1
3
x3+ax2-bx+1(a、b∈R)在区间[-1,3]上是减函数,则a+b的最小值是(  )
A.
2
3
B.
3
2
C.2D.3
题型:单项选择题

Most people buy a lot of gifts just before Christmas. But some people think we buy too much. They have started a special day called Buy Nothing Day. They don’t want anyone to go shopping on that day.

Buy Nothing Day is November 29. It’s 25 days before Christmas. It’s after Thanksgiving Day and often the first day of Christmas shopping. At this time, we see ads in Newspapers and on TV telling us to “buy, buy, buy!”

The idea for Buy Nothing Day started in Vancouver, British Columbia. Now people all over the world celebrate Buy Nothing Day. In California, parents and children get together to read stories, sing songs, and paint pictures. The children talk about why they don’t need a lot of toys. This year, in Manchester, England, people dressed up in costumes(统一服装) to tell people that we buy too much.

In Albuquerque, New Mexico, high school students wanted to tell other students about Buy Nothing Day. They organized a spaghetti dinner to give people information about Buy Nothing Day. They asked restaurants in the neighborhood to donate(捐赠) the food. They made posters and talked to other students about it. The dinner was a big success, and many students agreed not to buy anything on November 29. The students at high schools liked the idea of this new tradition. Next year, they want to have another dinner to tell more people about Buy Nothing Day!

小题1:Which of the following is NOT the day for people to celebrate Buy Nothing Day?

A.November 29.

B.25 days before Christmas.

C.After Thanksgiving.

D.The first day after Christmas.小题2:People usually buy many gifts_______.

A.before Thanksgiving

B.on Christmas

C.before Christmas

D.anytime小题3:How do people celebrate Buy Nothing Day?

A.In California, parents and children get together to play games.

B.In England, people celebrate by performing plays.

C.In Mexico, high school students dress up.

D.They buy nothing and persuade others not to buy things.小题4:What did the students do in New Mexico for the day?

A.They donated the food of their own.

B.They talked to others about it.

C.They made some slogans(标语口号) for it.

D.They organized a luxurious(奢华的) dinner.

题型:单项选择题

鞍区Cq、扫描技术不包括().

A.横断位扫描鞍区CT检查一般需作增强扫描

B.冠状位扫描最常用

C.冠状位扫描,先摄取头颅侧位定位像,扫描层面尽可能与鞍背平行或与鞍底垂直

D.垂体微腺瘤放大动态扫描无意义

E.层厚和层间距视蝶鞍大小选择2~3mm,扫描范围包括整个鞍区

题型:单项选择题

咽拭子培养采样法

题型:单项选择题

水的CT值是

A.-1000 Hu
B.-500 Hu
C.0 Hu
D.30 Hu
E.+1000 Hu

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