搜题请搜索小程序“爱下问搜题”
问题 单项选择题

患者男性，40岁，交通事故致复合创伤后1h入院。患者呼吸呈由浅慢逐渐加深加快，又由深快逐渐变为浅慢，继之暂停10s后再度出现上述状态的呼吸。该患者的呼吸是

A．间断呼吸
B．潮式呼吸
C．毕奥呼吸
D．鼾声呼吸
E．呼吸困难

答案

参考答案：B

单项选择题

糖酵解的关键酶之一是

A．变构酶
B．共价修饰
C．胆碱酯酶
D．二氢叶酸合成酶
E．己糖激酶
查看答案
单项选择题

Believe it or not，optical illusion can cut highway crashes.
Japan is a case in point．It has reduced automobile crashes on some roads by Rearly 75 percent using a simple optical illusion．Butst．ripes,called chevrons(人字形)，painted on ther rads make drivers think that they are driving faster than they really are，and thus drivers slow down.
Now the American Automobile Association Foundation for Traffic Safety in Washington D．C. is planning t。repeat Japan’s success．Starting next year，the foundati。n will paint cheyrons and。ther pattems of stripes on selected roads around the country to test how well the patterns reduce highway erashes．
Excessive(too great)speed plays a major role in as much as one fifth of all fatal traffic accidents， according to the foundation．To help reduce those accidents，the foundation will conduct its tests in areas where speed-related hazards(danger)are the greatest curves，exit slopes，traffic circles，and bridges．
Some studies suggest that straight，horizontal bars painted across roads can initially cut the average speed of drivers in half．However,traffic。ften returns to full speed within months as driVers become used to seeing the painted bars．
Chevrons，scientists say，not only give drivers the impression that they are driving faster than they reallv are but als0 make a lane appear to be narrower．The result is a longer lasting reduction in highway speed and the number of traffic accidents．

What does the author say about straight,horizontal bars painted across roads

A. They are suitable only on broad roads.
B. They are falling out of use in the United States.
C. They are ignored in a long period of time.
D. They cannot be used successfully to traffic circles.
查看答案