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问题 单项选择题

某女，41岁。劳累后心悸气促11年。查体：二尖瓣面容，第一心音亢进，心尖部可闻及Ⅲ级隆隆样舒张期杂音，有开瓣音，P2＞A2，心律规则，本次因为气促不能平卧伴咯血入院。最合适的疗法

A．镇咳剂

B．呋塞米静脉注射

C．毛花苷丙静脉注射

D．吸氧

E．止血剂

答案

参考答案：B

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 to withstand 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 services can be continuous. What’s more， clouds expand the types ofresources 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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单项选择题

柏努利方程也被称作能量方程，式中各项具有的量纲是( )。

A．(A) 能量的量纲

B．(B) 效率的量纲

C．(C) 质量的量纲

D．(D) 长度的量纲
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