管径大于或等于600mm的管道进行水压试验时，试验管段端部的第一个接口应采用柔性接口

油量为2500kg及以上的室外110kV变压器之间，如果无防火墙，则防火距离应不小于( )。

A．3m
B．5m
C．6m
D．8m

可用于治疗肝昏迷，但不能改善肝功能的药物是

A．金刚烷胺

B．左旋多巴

C．卡比多巴

D．苯海索

E．司来吉兰

Americans are often in a hurry. They rush to work, rush home, and rush through their meals. Workers and students usually have only half hour or an hour for lunch. As a result, a lot of Americans go and eat in fast food restaurants. The service is quick, and the prices are cheap.
What do fast food restaurants serve Of course, many of them have hot dogs, hamburgers, fried chicken, pizza, or ice cream. But other fast food restaurants specialize (专门从事) in different foods. Some places serve roast beef. Some serve fish and seafood. In fact, you can find popular foreign dishes in fast food restaurants, too. There are Italian restaurants with Italian sausage (香肠) and spaghetti (通心粉). And there are Chinese restaurants with Cantonese (粤式的) or Sichuan foods.

Which is NOT true about the fast food restaurants in a franchise
[A] Each restaurant has a different owner.
[B] The name of the restaurants is the same both in U.S.A. and other countries.
[C] The food sold everywhere costs the same.
[D] The food tastes the same everywhere.

A lot of fast food restaurants are franchises (产品经销特许权), a very popular form of business in the United States. There are many restaurants in a franchise, and each franchise has a different owner. However, all of the restaurants are under one central management, and the name of the restaurants is the same everywhere in the United States — and in foreign countries, too. This kind of central control guarantees that, for example McDonald’s hamburgers and Kentucky Fried Chicken taste the same everywhere.
In modern American life, fast food restaurants are very important. They provide quick and inexpensive meals for American people in a hurry.

对于缺少脂肪衬托的受检者，为改善显示效果，可采取（）

A.调低窗位

B.调高窗位

C.调大窗宽

D.调小窗宽

E.采用类骨窗

最初的无声电影，也被称为（）。