试题与答案

下列哪项超声表现为鉴别颈动脉海绵窦瘘和海面窦血栓的特异性表现 A.眼上静脉明显扩张

题型:单项选择题

题目:

下列哪项超声表现为鉴别颈动脉海绵窦瘘和海面窦血栓的特异性表现

A.眼上静脉明显扩张

B.眼上静脉压力增高

C.眼上静脉反向血流

D.多普勒频谱示海绵窦静脉血流动脉化

E.同侧颈内动脉血流量增高,阻力指数下降

答案:

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参考答案:D解析:[知识点] 计算机的应用领域。[评析] 数据处理是计算机应用的一个重要领域,数据处理用来泛指非科学工程方面的所有计算管理和操纵任何形式的数据。

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题型:问答题

如图所示,在直角坐标系 xoy 的第一象限内存在沿 y 轴负方向、场强为 E 的匀强电场,在第四象限内存在垂直纸面向外、磁感应强度为 B 的匀强磁场,在磁场与电场分界线的 x 轴上有一无限大的薄隔离层.一质量为 m、电量为+q、初速度为零的带电粒子,从坐标为( x 0,y 0)的 P 点开始被电场加速,经隔离层垂直进入磁场,粒子每次穿越隔离层的时间极短,且运动方向不变,其穿越后的速度是每次穿越前速度的 k 倍( k<1).不计带电粒子所受重力.求:

(1)带电粒子第一次穿越隔离层进入磁场做圆周运动的半径 R 1

(2)带电粒子第二次穿越隔离层进入电场达到最高点的纵坐标  y1

(3)从开始到第三次穿越隔离层所用的总时间  t;

(4)若带电粒子第四次穿越隔离层时刚好到达坐标原点 O,则 P 点横坐标 x0与纵坐标 y0应满足的关系.

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题型:阅读理解

TOUR THE BLUE MOUNTAINS IN COMFORT WITH OZ TRAILS

Known as “The Grand Canyon” of Australia, it is located a short distance (55 km) from Sydney .

In 2000 this area was added to the “World Heritage List” of UNESCO as it has: deep valleys, impressive waterfalls, excellent bushes and rich plants and animals.

The Blue Mountains covers about 10,000 km and extends 220 km.

The Blue Mountains area contains eight conservation areas, six Aboriginal language groups .It is also home to 127 kinds of rare or threatened plants and 52 kinds of rare or threatened animals.

LET OZ TRAILS SHOW YOU AUSTRALIAN NATURE AT IT’S BEST!

Oz Trails has been in operation since 1999 and has shown the Blue Mountains to thousands of travelers from all over the world.

OZ TRAILS is recommended by the "LONELY PLANET" and "LET'S GO" travel guides, both of which are popular travel books in Australia.

We also offer special tours in and around Sydney.Taking small groups only, we pride ourselves on customer service.We offer travelers individual attention that is not available on other

large tours.

All the tours are also available at charter rates (包租费) whether you wish to bring a whole group or have the tour just for yourself.We can make a tour to meet your special needs.

6 REASONS TO TOUR THE BLUE MOUNTAINS WITH OZ TRAILS

1.Small groups only (max 24 passengers in each bus).

2.Free hotel pickup anywhere in city centre (and also in Coogee, Bondi and Manly) by arrangement in advance.

3.Perfect guides with a broad knowledge.

4.We are able to take you to see all the famous places in Australia.

5.Our tours are both affordable and satisfying.

6.Comfortable—air-conditioned buses.

1.The author wrote this passage to________.

A.introduce famous scenic sports around Sydney

B.attract tourists to the Blue Mountains

C.advertise a tour agency named Oz Trails

D.give advice on how to choose a tour company

2.Which of the following does Oz Trails offer?

A.Small group tours with not more than 24 tourists.

B.Buses without air conditioners.

C.Charter rates for groups of 24.

D.One-to-one service at a low price.

3.We can learn from the passage that________.

A.Coogee and Bondi are located in the city center

B.travelers need to book their pickup in advance

C.OZ TRAILS can take you to foreign countries

D.“Lonely Planet” is a famous travel company

4.Which of the following is NOT mentioned in the passage?

A.The price of the tour service.

B.The services the agency can offer.

C.Some of the features of the Blue Mountains.

D.A brief introduction to Oz Trails.

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