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问题 问答题 简答题

试述经典型预激综合征的心电图表现。

答案

参考答案：

经典型预激综合征的心电图表现有：①P-R间期<0.12秒。②QRS波起始部钝挫，出现预激波。③QRS波时间>0.11秒。④P-J间期正常，<0.26秒。⑤继发性ST-T改变。

单项选择题

以中药材为原料，在中医药理论指导下，按经药政部门批准的处方和制法大量生产，有特有名称并标明功能主治、用法用量和规格，可经医生诊治后处方配给，也可由患者直接自行购用的药品，称为（）。

A.药品

B.中成药

C.制剂

D.药物
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单项选择题

B


Each year there is an increasing number of cars on roads and street are millions of new cars are produced. One out of every six Americans works at putting together the parts of cars, driving trucks, building roads of filling cars with gas. Americans won’t live without cars!
Most Americans find it hard to think what life would be without a car. However some have realized the serious problem of air pollution by cars. The polluted air is poisonous(有毒的) and dangerous to health.
One way to get rid of(排除)the polluted air is to build a new kind of car. That’s what several of the large car factories are trying to do. But to build a clean car is easier said than done. Progress in this field has been slow.
Another way is to take the place of the car engine(发动机) by something else. Engineers are now working on some new cars. Many makers believe that it will take years to develop a practical model that pleases man.
To prevent the world from being polluted by cars, we’ll have to make some change in the way many of us live. Americans, for example, have to cut down on the number of their cars. They are encouraged to travel and go to work by bike. Riding a bike is thought to help keep the air clean.
But this change does not come easily — a large number of workers may find themselves without jobs if a car factory closed down. And the problem of air pollution would become less important than that of unemployment(失业).
Although cars have brought us a better life, they have also brought us new problems.

The writer wants to tell us that ______.

A．riding a bike is the only way out

B．the number of cars must be cut down

C．man won’t live without cars

D．cars bring us not only a better life but also serious problems
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