稳定性心绞痛() A.冠状动脉痉挛 B.冠状动脉内完全闭塞性血栓形成 C.冠状动脉斑

题型:单项选择题 B型题

问题:

稳定性心绞痛()

A.冠状动脉痉挛

B.冠状动脉内完全闭塞性血栓形成

C.冠状动脉斑块破裂不完全血栓形成

D.冠状动脉粥样硬化狭窄≥75%

E.冠状动脉粥样硬化狭窄≤50%

考点:血液病主治医师血液主治医师基础知识历年真题精选(B型题)
题型:单项选择题 B型题

胜任力模型

题型:单项选择题 B型题


The central problem of economics is to satisfy the people’s and nation’s wants. The problem we are faced with is that our (1) , here identified as money, are (2) . The only way we can resolve our (3) is to make choices. After looking at our resources, we must examine our list of (4) and identify the things we need (5) , those we can postpone, and (6) we cannot afford. As individuals, we face the central problem involved in economics — deciding just how to allocate our limited resources to provide ourselves with the greatest (7) of our wants.
Nations face the same problem. As a country’s population (8) , the need for more goods and services grows (9) . Resources necessary to production may increase, but there are (10) enough resources to satisfy the total desires of a (11) . Whether the budget meeting is taking place in the family living-room, in the conference room of the corporation (12) of directors, or in the chamber of the House of Representatives in Washington, the basic problem still exists. We need to find (13) of allocating limited resources in order to satisfy unlimited wants.
A short time ago, economists divided goods into two categories, free and economic. The former, like air and water, were in (14) abundance that economists had no concern about (15) of scarcity and what to do about it. Today many of these "free goods" are in (16) very expensive to use. Pollution has made clean air and water expensive for producers who have to filter their waste products, for consumers who ultimately pay for the producers’ extra costs, and (17) tax-payers who pay for the government’s involvement in cleaning the environment.
In the 1990s, almost all goods are (18) . Only by effort and money can they be (19) in the form people wish.
Meeting the needs of people and the demands from resources available leads to the basic activity of production. In trying to (20) unlimited wants from limited economic goods, production leads to new problems in economics.

题型:单项选择题 B型题
汽车发动机的额定功率为100kW,当汽车以额定功率在平直公路上匀速行驶时,所受的阻力的大小是4000N,则行驶的速度为(  )

A.0.25m/s

B.20m/s

C.25m/s

D.40m/s

题型:单项选择题 B型题

地核分为外地核和内地核,外地核呈固态状态。

题型:单项选择题 B型题

特种设备安全监察条例规定的压力管道是最高工作压力大于或等于0.1Mpa、且公称直径()的管道。

A、大于25mm

B、大于50mm

C、小于25mm

D、小于50mm

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