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问题 多项选择题

下列选项与HCV感染慢性化机制有关的因素是

A．HCV可存在于肝外组织中，使得病毒感染不易清除

B．HCV在体内复制水平低，不易诱导高水平的免疫应答

C．HCV在体内复制水平高，容易诱导高水平的免疫应答

D．HCV可存在于肝外组织中，使得病毒感染易清除

E．HCV基因易发生变异，从而逃避免疫清除作用

答案

参考答案：A, B, E

单项选择题

At a basic level, cloud computing is simply a means of delivering IT resources as (1) . Almost all IT resources can be delivered as a cloud service: applications,compute power, storage capacity, networking, programming tools, even communication services and collaboration (2). 　　

Cloud computing began as large-scale Internet Service providers such as Google,Amazon,and others built out their infrastructure. An architecture emerged: massively scaled, (3) distributed system resources, abstracted as virtual IT services and managed as continuously configured, pooled resources. In this architecture, the data is mostly resident on (4) "somewhere on the Internet" and the application runs on both the "cloud servers" and the user's browser. 　　

Both clouds and grids are built to scale horizontally very efficiently. Both are built to withstand failures of (5)elements or nodes. Both are charged on a per-use basis. But while grids typically process batch jobs, with a defined start and end point, cloud Service can be continuous. What's more, clouds expand the types of resources available file storage, databases, and Web Service and extend the applicability to Web and enterprise applications.

空白（3）处应选择（）

A.horizontally

B.vertically

C.inclined

D.decreasingly
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多项选择题

对医务人员的具体要求是（）。

A.尽力避免临床上可能对病人造成伤害的情况

B.对危急情况的诊治措施要认真权衡利弊

C.允许病人死亡但要遵循不伤害原则

D.提供最佳的治疗和护理

E.要有为病人利益.健康着想的动机和意向
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