关于相对危险度的叙述,下列哪项是正确的A.不是流行病学病因调查的测量指标 B.在估计

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问题:

关于相对危险度的叙述,下列哪项是正确的

A.不是流行病学病因调查的测量指标

B.在估计公共卫生措施的影响时比特异危险度更有用

C.在调查特定疾病的病因时比归因危险度更有用

D.无效假设值为零

E.以上都不是

考点:骨外科学主治医师骨外科专业知识骨科主治医师专业知识5
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绿色食品标志与一般商品标志有什么区别?

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三角板上有(    )个角,其中有(    )个直角。

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把一条盘在地上、长为L的质量分布均匀的软绳向上提起,当绳刚好拉直时,它的重心位置升高了       ;把一边长为L的正方形匀质薄板ABCD(图1-2-4所示)绕C点翻到对角线AC处于竖直位置时,其重心升高了      

图1-2-4

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A new plan for getting children to and from school is being started by a local government in Eastern England. This could end the worries of many parents fearful for their children’s safety on the roads.

Until now the local government has only been prepared to provide bus services for children living more than three miles from their school, or sometimes less if special reasons existed. Now it has been decided that if a group of parents ask for help in organizing transport they will be prepared to go ahead, as long as the arrangement will not lose money and children taking part will be attending their nearest school.

The new plan is to be tried out this term for children living at Milton who attend Impington School. The children live just within the three-mile limit and the local government said in the past that they would not undertake (agree) to provide free transport to the school. But now they have agreed to offer a sum of money for a bus service from Milton to Impington and back, a plan which has the support of the school’s headmaster.

Between 50 and 60 parents have said they would like their children to take part. Final calculations have still to be carried out, but a government official has said the cost to parents should be less than £20 a term. They have been able to arrange the service at a low cost because there is already an agreement with the bus company for a bus to take children who live further away to Impington. The same bus would now just make one more journey to pick up the Milton children. The official said they would get in touch with other groups of parents who in the past had asked if transport could be provided for their children, to see if they would like to take part in the new plan.

小题1:What is the aim of the plan?

A.To prevent the students’ road accidents.

B.To relieve the traffic pressure.

C.To save time for the parents and students.

D.To help the parents save money.小题2:How can the local government arrange the new bus service at a low cost?

A.By letting the bus run in the morning only.

B.By limiting the number of the students.

C.By getting the support from the headmaster.

D.By linking the new bus service with the existing one.小题3:Which of the following is possible if the plan is carried out?

A.The bus company will make much more money.

B.The children can choose whatever school they like.

C.The parents can get rid of their worries.

D.The students in Impington School can have free bus rides.小题4:This passage is most probably____________.

A.a personal letter

B.an advertisement

C.a headmaster’s report

D.a newspaper article

题型:单项选择题

患者男性,43岁,因腹痛,消瘦来诊,行胃镜检查示胃溃疡。

该患者腹痛发生的机制不包括

A.对胃酸刺激的痛阈降低

B.局部肌张力增高

C.胃酸对溃疡面的刺激

D.溃疡及其周围组织的炎性病变使局部内感受器的敏感性降低

E.浆膜面受侵

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