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问题 多项选择题

关于广泛性发育障碍，下列说法中正确的是（）

A.起病于婴幼儿时期

B.心理发育广泛受损

C.大部分患者预后不佳

D.多合并有精神发育迟滞

E.主要表现为人际交往困难、兴趣范围局限、活动内容刻板重复

答案

参考答案：A, B, C, D, E

单项选择题

Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must (52) an educational institution, and they are required to study for a (53) of fifteen hours a week on a daytime course. Prospective students have to show that they can afford their studies, and that they have sufficient (54) resources to support themselves (55) in this country.

In order to work here the foreigner needs a work permit, (56) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (57) these permits, and there is little that can be done (58) it; it would be extremely unwise for a foreign visitor to work (59) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the European countries, who are often given (60) residence permits of up to five years. Some other people, such as doctors, foreign journalists, authors and others can work without permits, and foreign students are normally allowed to (61) part-time jobs while they are studying here.

54().

A.natural 

B.financial 

C.human 

D.economical
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单项选择题

下列各项哪些不是空压机在加气站的作用（）。

A.提供吹扫用气

B.为加气站气动阀提供动力源

C.压缩天然气
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