比1小2的数是( ) A.-3 B.-1 C.1 D.3

题型:选择题

问题:

比1小2的数是(  )

A.-3

B.-1

C.1

D.3

考点:有理数减法
题型:选择题
曲线y=
2x
x2+1
在点(0,0)处的切线方程为______.
题型:选择题

用RSA算法加密时,已知公钥是(e=7,n=20) ,私钥是(d=3,n=20) ,用公钥对消息M=3加密,得到的密文是( )。

A.19

B.13

C.12

D.7

题型:选择题


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:选择题

女,55岁,进行性咽下困难3个月,伴消瘦、纳差,下列哪项检查方法最有助于明确诊断()

A.胸部CT

B.胸部X线检查

C.胸部MRI

D.胃镜检查

E.喉镜检查

题型:选择题

陈某(15周岁)因喜好计算机,于某日深夜潜入一公司内盗窃价值3万余元的计算机元器件 (事发后均被追回)。现问,对陈某应当如何处理( )

A.追究刑事责任

B.不追究刑事责任

C.从轻、减轻处罚

D.责令他的家长加以管教

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