问题 单项选择题 A1型题

以下肺上皮细胞通透性测定的数据处理,哪项是正确的()。

A.对双肺周边勾画感兴趣区,包括支气管等中心部分

B.肺清除拟合曲线为抛物线形

C.正常人肺上皮细胞通透性的放射性活度-时间曲线为双指数曲线

D.肺上皮损伤时,肺上皮细胞通透性的放射性活度-时间曲线为双指数曲线

E.测定肾脏的清除,可直接反映双肺肺上皮细胞的通透性

答案

参考答案:D

解析:采用对双肺周边勾画感兴趣(避开支气管等中心部分)的方法求出双肺放射性活度-时间曲线,以最小二乘法拟合。肺清除拟合曲线近似直线,上皮细胞通透性的放射性活度-时间曲线为单指数曲线,肺上皮损伤时为双指数曲线。测定肾脏的清除,可知道真正直接反映肺泡毛细血管膜的部分,而不包括由于感兴趣区勾画不准确而造成的纤毛清除等因素对肺总清除率的影响。

阅读理解


 
It’s located at the western gate, just beside the ticket center.  The center provides a series of services, such as guide service, free water supply, guide books, charging mobile phones, baby carriage, first-aid medicine, and simple health care. You can also buy some souvenirs like stamps, postcards and tiger toys.
         

It’s located at the eastern and western gates of the Pearl Spring Scenic Area. There are all kinds of tickets, such as tickets for the scenic area and tickets for amusement park.


Dingshan Pavilion Dining Hall, a large-scale dining centre, can receive 300 people for dining at the same time. It lies in the Scenic Area. Tourists can enjoy the beautiful scenery while eating. It’s open from 8 a.m. to 8 p.m. every day.

Transportation Guide

 

You can take No. 168 bus from Gulou Bus Stop and get off at Pearl Spring Bus Stop. The bus stop is just outside the Scenic Area. You can also drive here.
小题1:According to the leaflet, visitors can ______ at Tourist Service Centre.
A.take a bus B.buy a ticketC.get guide booksD.have snacks
小题2:Dingshan Pavilion Dinning Hall ______.
A.is a large-scale dining centre
B.is located next to the Ticket Centre
C.is open to the public 16 hours a day
D.can receive 300 people for dinner in a day
小题3:Visitors to the Scenic Area can ______.
A.only take a bus there
B.get water for free if they are thirsty
C.have one choice if they want to buy tickets
D.sell souvenirs, such as stamps and postcards
选择题