关于肛裂的叙述,下列哪项是正确的() A.肛裂是肛管部深达肌层的小溃疡 B.肛裂、前

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问题:

关于肛裂的叙述,下列哪项是正确的()

A.肛裂是肛管部深达肌层的小溃疡

B.肛裂、前哨痔和齿状线上相应的 * * 肥大,称为肛裂"三联征"

C.主要症状是排便时出血

D.绝大多数发生在肛管前正中部

E.手术切除肛裂是治疗急性肛裂唯一有效的方法

考点:乡镇临床执业助理医师消化系统综合复习题消化系统综合复习题题库
题型:单项选择题 A1型题

“按规定程序,加入一种或数种辅料,反复炮制”的炮制工艺是

A.蒸法

B.煮法

C.焊法

D.复制法

E.发酵法

题型:单项选择题 A1型题

缺O2引起呼吸兴奋是通过 ( )

A.直接兴奋呼吸中枢
B.兴奋中枢化学感受器
C.刺激颈动脉窦和主动脉弓压力感受器
D.刺激颈动脉体和主动脉体化学感受器
E.呼吸肌本体感受性反射

题型:单项选择题 A1型题

采用蒸发时形成薄膜和泡沫增加汽化表面进行蒸发浓缩的方法是()

A.减压浓缩

B.常压浓缩

C.薄膜浓缩

D.加压浓缩

E.多效浓缩

题型:单项选择题 A1型题

A

Imagine, one day, getting out of bed in Beijing and being at your office in Shanghai in only a couple of hours, and then, after a full day of work, going back home to Beijing and having dinner there.

Sounds unusual, doesn’ t it But it’ s not that unrealistic, with the development of China’ s high-speed railway system. And that’ s not all. China has an even greater high-speed railway plan to connect the country with Southeast Asia, and eventually Eastern Europe.

China is negotiating to extend its own high-speed railway network to up to 17 countries in 1 0 to 15 years, eventually reaching London and Singapore.

China has proposed three such projects. The first would possibly connect Kunming with Singapore via Vietnam and Malaysia. Another could start in Urumqi and go through Kazakhstan and Uz-bekistan, and possibly to Germany. The third would start in the northeast and go north through Russia and then into Western Europe.

If China’ s plan for the high-speed railway goes forward, people Could zip over from London to Beijing in under two days.

The new system would still follow China’ s high-speed railway standard. And the trains would be able to go 346 kilometers an hour, almost as fast as some airplanes.

China’s bullet train(高速客车), the one connecting Wuhan to Guangzhou, already has the World’ s fastest average speed, It covers 1,069 kilometers in about three hours.

Of course, there are some technical challenges to overcome. There are so many issues that need to be settled, such as safety, rail gauge (轨距), maintenance of railway tracks. So it’s important to pay attention to every detail.

But the key issue is really money. China is already spending hundreds of billions of yuan on domestic railway expansion.

China prefers that the other countries pay in natural resources rather than with capital investment. Resources from those countries could stream into China to sustain development.

It’ll be a win-win project. For other countries, the railway network will definitely create more opportunities for business, tourism and so on, not to mention the better communication among those countries.

For China, such a project would not only connect it with the rest of Asia and bring some much-needed resources, but would also help develop China’ s far west. We foresee that in the coming decades, millions of people will migrate to the western regions, where the land is empty and resources unused. With high-speed trains, people will set up factories and business centers in the west once and for all. And they’ 11 trade with Central Asian and Eastern European countries.

According to the passage , the greatest challenge to the new high-speed railway plan is()

A. technical issues

B. safety of the system

C. financial problems

D. maintenance of railway tracks

题型:单项选择题 A1型题

()是运动的单元。

A.构件

B.杆件

C.零件

D.部件

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