市售合成纤维的“涤纶”，是属于[ ] A．有机高分子化合物 B．天然棉花制成成品

患儿女性，3个月，以哭闹后青紫就诊。查体：精神呆板，眼距宽，双眼外侧上斜，四肢短，肌张力低，心尖部Ⅱ～Ⅲ级收缩期杂音，胸透心脏无扩大，服软，肝脾不大。

进一步做那些检查？

中心性发绀常具有的特点是（）

A.常出现在肢体末梢

B.伴有皮肤温度降低

C.见于右心衰竭时

D.见于发绀型先天性心脏病时

E.见于严重休克时

测定中药中含有的水分，主要方法有

A．烘干法

B．甲苯法

C．红外线干燥法

D．电阻法

E．水分测定仪速测法

　In a great many cities, hundreds of people ride bicycles to work everyday. In New City, some bike riders have even formed a group called Bike for a Better City. They declare that if more people rode bicycles to work, there would be fewer automobiles(汽车) in the downtown part of the city and so less dirty air from car engines. For several years this group has been trying to get the city government to help bicycle riders. For example. They want the city to draw special lanes(通道) for bicycles only on some of the main streets, because when bicycle riders must use the same lanes as cars, there are accidents. Bike for a Better city feels that if there were special lanes more people would use bikes.

But no bicycles lanes have been drawn. Not everyone thinks they are a good idea-----they say it will slow traffic. Some store owners on the main streets don't like the idea------they say that if there is less traffic, they will have less business.

The city government has not yet decided what to do. It wants to keep everyone happy. On weekends, Central Park----the largest place of open ground in New York----is closed to cars, and the roads may be used by bicycles only. But Bike for a Better City says that this is not enough and keeps fighting to get bicycle lanes downtown.

73. The bike riders suggest that _____________.

A. bicycles should be used instead of cars    B. bicycle lanes should be drawn

C. fewer buses or cars should be used  D. the number of special lanes should be increased

74. The advantage(好处) of the special lanes is that _______.

A. they will make cars and buses run slowly   B. they will make it easier for bike riders to go to parks

C .they will make the city more beautiful    D. the lanes will prevent accidents

75. The government has not decided whether special lanes should be drawn ______.

A. so that everyone is disappointed      B. because there are different opinions

C. because most people travel by train   D. because Bike for a Better City is not strong enough

经皮神经电刺激的电流形态有（）

A.单向方波

B.双向不对称方波

C.调制型

D.非调制型

E.双向对称型方波