检查肺动脉瓣狭窄时,彩色多普勒血流显像的滤波(filter)应怎样调节()。 A.用

题型:单项选择题 A型题

问题:

检查肺动脉瓣狭窄时,彩色多普勒血流显像的滤波(filter)应怎样调节()。

A.用中等频率滤波,使血流显示充满肺动脉

B.不用滤波器,以免干扰血流信号

C.用低通滤波,使血流不失真

D.选用高通滤波,以减少、消除低速信号干扰

E.以上都不是

考点:超声波医学与技术(主管技师)超声主管技师基础知识综合练习超声主管技师基础知识综合练习题库
题型:单项选择题 A型题

阅读理解。

       For several years, Americans have enjoyed teleshopping-watching TV and buying thing by

phone. Now, teleshopping is starting in Europe. In a number of European countries, people can

turn on their TVs and shop for clothes, jewelry, food, toys and many other thing.

      Teleshopping is becoming popular in Sweden. For example, the biggest Swedish teleshopping

company sells different kinds of things on TV in 15 European countries, and in one year it made $

100 million. In France, there are two teleshopping channels (频道), and the French spend $ 20

million a year buying things through those channels.

      In Germany, until last year, teleshopping was on one channel for one hour every day. Then

the government allowed more teleshopping.  Other channels can now open for telebusiness,

including teleshoping, because it allows people to do their shopping without leaving their homes.

With all the problems of traffic in the cities, this is an important reason to allow more teleshopping.

But at the same time, other Europeans do not like this new way of shopping. They call teleshopping

" junk on the air". Many Europeans worry about the quality of the things for sale on TV. Good quality

is important to them, and they believe they can't be sure about the quality of the things they see on TV.

       The need for high quality means that European teleshopping companies will have to be different

from American companies. They will have to be more careful about the quality of the things they sell.

They will also have to work harder to sell things that the buyers can't touch or see in person.

1. In which countries can people teleshop?

    _________________________________

2. What is teleshopping?

    _________________________________

3. In which countries does the biggest Swedish company sell things? 

    _________________________________

4. What do some European worry about? 

    _________________________________

5. What must Europeans teleshopping companies do to make people buy things? 

    _________________________________

题型:单项选择题 A型题

完全臀先露的特点为胎儿()

A.一膝或双膝关节先露

B.双髋关节及双膝关节均屈曲

C.双髋关节及双膝关节均伸直

D.双髋关节伸直,双膝关节屈曲

E.双髋关节屈曲,双膝关节伸直

题型:单项选择题 A型题

无极绳绞车前方声光报警器额定电压为()V。

A.36

B.127

C.380

D.660

题型:单项选择题 A型题

根据IMF协定第八条规定,货币可兑换概念是指()

A、经常项目可兑换

B、资本项目可兑换

C、金融项目可兑换

D、完全可兑换

题型:单项选择题 A型题

如果说“舌尖上的中国”展现了中华饮食文化的博大精深,那么“舌尖上的浪费”,则呈现了一种丑陋的饮食观。自从中央提出厉行勤俭节约等“八项规定”、反对浪费的号召以来,民间发起了“光盘行动”,号召国人向好面子、穷摆阔“说不”。有效遏制“舌尖上的浪费”()

①要通过教育对落后文化予以改造和剔除

②要坚决抵制资本主义腐朽思想对我国的冲击

③要对传统文化发起“移风易俗”的彻底革命

④要用社会主义荣辱观引领社会文明风尚

A.①④

B.①③

C.②④

D.③④

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