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问题 单项选择题 A1型题

营养性缺铁性贫血的主要病因是（）

A.红细胞生成减少

B.血红蛋白合成减少

C.红细胞破坏过多

D.红细胞丢失过多

E.造血功能障碍

答案

参考答案：B

解析：由于铁是合成血红蛋白的原料之一，缺乏时可使血红蛋白合成减少。

选择题

2012年5月8日，湖南遭遇强降雨、强雷电、局地冰雹等灾害性天气。如果我们在户外遇到雷雨天气时，科学的应对方法有[ ]

①立即寻找避雷场所

②与他人拉开距离，不要挤在一起

③拨打手机告诉父母或老师

④骑自行车回家

A．①②

B．②③

C．①③

D．②④
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单项选择题

A basic premise of OGSA is that everything is (66) by a service: a network enabledentity that (67) some capability through the exchange of messages. Computational resources, storage resources, networks, programs, databases, and so forth are all (68) . This adoption of auniform service-oriented model means that all components of the environment are virtual. Morespecifically, OGSA represents everything as a Grid service: a Web service that conforms (69) a set of conventions and supports standard interfaces for such purposes as lifetime management. This core set of consistent interfaces, from which all Grid services are implemented. (70) the construction of hierarchical, higher - order services that can be treated in a uniform way across layers of abstraction.

69（）

A．of

B．to

C．as

D．from
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