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问题 单项选择题 B1型题

胆道蛔虫症（）

A.阵发性右上腹绞痛，疼痛剧烈至弯腰翻滚，有排虫或吐虫史

B.先在上腹部或脐周痛，后持续性右下腹痛，有固定压痛点及肌紧张，可有发热、呕吐

C.突然间歇性腹痛哭闹，不久出现呕吐，6小时后出现血便，右上腹可摸到腊肠样包块

D.脐周有间歇性钝痛，或轻或重，痛时喜按，腹软无压痛，有排虫史

E.阵发性或持续性腹痛，呕吐，腹软，腹股沟可见肿物

答案

参考答案：A

单项选择题

The United States is well-known for its network of major highways designed to help a driver get from one place to another in the shortest possible time. (51) these wide modern roads are generally smooth and well maintained, with (52) sharp curves and many straight sections, a direct route is not always the most (53) one. Large highways often pass by scenic areas and interesting small towns. Furthermore, these highways generally (54) large urban centers which means that they become crowded with heavy traffic during rush hours, (55) the "fast, direct" way becomes a very slow route.

However, there is almost always another route to take (56) you are not in a hurry. Not far from the (57) new "super highways", there are often older, less heavily traveled roads which go through the countryside. (58) of these are good two-lane roads; others are uneven roads curling through the country. These secondary routes may go up steep slopes, along high cliffs, or down frightening hillsides to towns (59) in deep valleys. Through these less direct routes, longer and slower, they generally go to place where the air is clean and the scenery is beautiful, and the driver may have a (60) to get a fresh, clean view of the world.

59（）。

A. lying

B. laying

C. laid

D. lied
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问答题 简答题

简述在光纤传输网中常用到的光无源器件有哪些？
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