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问题 单项选择题

在60℃下，引发剂过氧化二碳酸二环己酯的t½=1h，过氧化十二酰的t½=12.7h，分别引发聚合时，如希望聚合速率差不多，则两者的用量应为（）

A.两者用量一样

B.DCPD用量应比LPO多

C.DCPD用量应比LPO少

答案

参考答案：C

单项选择题

At a basic level, cloud computing is simply a means of delivering IT resources as （）. Almost all IT resources can be delivered as a cloud service: applications, compute power, storage capacity, networking, programming tools, even communication services and collaboration （）. Cloud computing began as large-scale Internet service providers such as Google, Amazon, and others built out their infrastructure. An architecture emerged: massively scaled, （） distributed system resources, abstracted as virtual IT services and managed as continuously configured, pooled resources. In this architecture, the data is mostly resident on （） "somewhere on the Intemet" 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 towithstand failures of （） 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 servics can be continuous. What's more, clouds expand the types of resources available——file storage, databases, and Web services——and extend the applicability to Web and enterprise applications.

At a basic level, cloud computing is simply a means of delivering IT resources as （）.

A．hardware

B．computers

C．services

D．software
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选择题

一个物体的重力势能减少了，这是因为（　　）

A．它所处的高度减少了

B．它所处的高度增加了

C．它的速度减少了

D．它在水平面上的位置改变了
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