问题 多项选择题

关于平、纵面线形组合设计,正确的有()。

A.当竖曲线与平曲线组合时,竖曲线宜包含平曲线

B.要保持平曲线与竖曲线大小的均衡

C.一个平曲线内,必须避免纵断面线形的反复凸凹

D.满足驾驶员视觉和心理上的要求

E.竖曲线的顶、底部可插入小半径的平曲线

答案

参考答案:B, C, D

单项选择题

Aspirin is one of the safest and most effective drugs invented by man. The most popular medicine in the world today, it is an effective pain reliever. Its bad effects are relatively mild. It is also cheap.For millions of people suffering from arthritis, it is the only thing that works. Aspirin, in short, is truly the 20th-century wonder drug. It is also the second largest suicide drug and is the leading cause of poisoning among children. It has side effects that, although relatively mild, are largely unrecognized among users.Although aspirin was first sold by a German company in 1899, it has been around much longer than that. Hippocrates, in ancient Greece, understood the medical value of tree barks and leaves which today are known to contain a chemical found in aspirin. During the 19th century, there was a great deal of experimentation in Europe with this chemical, and it led to the introduction of aspirin. By 1915, aspirin tablets were available in the United States.A small quantity of aspirin relieves pain and inflammation. It also reduces fever by affecting some of the body’’s reactions. Aspirin is very irritating to the stomach lining. The best way is to chew the tablets before swallowing them with water, but few people can stand the bitter taste. Some people suggest crushing the tablets in milk or orange juice.

A good title for this passage would be:________

A.Why Do We Take Aspirin

B.How Do We Take Aspirin

C.Aspirin: The Unknown Side Effects.

D.Aspirin: The Most Popular Medicine.

单项选择题