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问题 单项选择题

哪一种疾病的血象，骨髓象中血小板，巨核细胞均减少

A．慢性特发性血小板减少性紫癜

B．自身免疫溶性血性贫血合并免疫性血小板减少性紫癜（Evan's）

C．脾功能亢进

D．巨幼细胞性贫血

E．再生障碍性贫血

答案

参考答案：E

单项选择题

Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number of computers (1) through a real-time communication network such as the Internet. In science, cloud computing is a (2)for distributed computing over a network, and means the (3) to run a program or application on many connected computers at the same time. The architecture of a cloud is developed at three layers: infrastructure, platform, and application. The infrastructure layer is built with virtualized compute, storage, and network resources. The platform layer is for general-purpose and repeated usage of the collection of software resources. The application layer is formed with a collection of all needed software modules for SaaS applications. The infrastructure layer serves as the (4)for building the platform layer of the cloud. In turn, the platform layer is a foundation for implementing the (5) layer for SaaS applications.

空白（2）处应选择（）

A.replacement

B.switch

C.substitute

D.synonym（同义词）
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单项选择题

甲、乙两辆汽车，在机场与售票处往返行驶。甲车去时速度60千米/小时，回来时速度40千米/小时；乙车往返的速度都是50千米/小时，则甲、乙两车往返一次的时间之比是（）。

A．25:24

B．3:2

C．5:4

D．10:9
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