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问题 单项选择题

一孕妇，G1P0孕28周，超声示胎盘下缘距宫内口约2cm，最可能的诊断（）

A.中央性前置胎盘

B.边缘性前置胎盘

C.部分性前置胎盘

D.胎盘前置状态

E.低置胎盘

答案

参考答案：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 (51) an educational institution, and they are required to study for a minimum of fifteen hours a week on a (52) course. Prospective students have to show that they can afford their studies, and that they have sufficient (53) resources to support themselves (54) in this country.

In order to work here the foreigner needs a work permit, (55) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (56) these permits, and there is little that can be done (57) it; it would be extremely unwise for a foreign visitor to work (58) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the Common Market countries, who are often given (59) 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 (60) part-time jobs while they are studying here.

54().

A.after 

B.but 

C.while 

D.before
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填空题

压力拱理论稳定条件：（），适用条件：能够形成压力拱，即洞室上方有足够的厚度且有相当稳定的岩体。
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