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【简答题】
已知集合N={1，2，3，4，…，n}，A为非空集合，且A N，定义A的“交替和”如下：将集合A中的元素按由大到小排列，然后从最大的数开始，交替地减、加后续的数，直到最后一个数，并规定单元素集合的交替和为该元素，例如集合{1，2，5，7，8}的交替和为8-7+5-2+1=5，集合{4}的交替和为4，当n=2时，集合N={1，2}的非空子集为{1}，{2}，{1，2}，记三个集合的交替和的总和为S 2 =1+2+（2-1）=4，则n=3时，集合N={1，2，3}的所有非空子集的交替和的总和S 3 =（ ）；集合N={1，2，3，4，…，n}的所有非空子集的交替和的总和S n =（ ）。
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【单选题】Neponia is a small planet in a distant galaxy visible only through high-powered radio telescopes positioned on satellites orbiting the Earth.
A.
The small planet Neponia is in a far-away part of the universe and can be seen only by astronomy equipment located in space.
B.
Only equipped with high-powered radio telescopes established on satellites in space can we see Neponia clearly, a tiny planet in a distant galaxy.
【单选题】Neponia is a small planet in a distant galaxy visible only through high powered radio telescopes positioned on satellites orbiting the Earth.
A.
As we know ， Neponia is a small planet in a distant galaxy which can be seen only through high powered radio telescopes which is installed on satellite .
B.
The small planet Neponia is in a far-away part of the universe and can be seen only by astronomy equipment located in space.
C.
Only equipped with a high powered radio telescope established on satellites in space can we see clearly Neponia, a tiny planet in a distant galaxy.
【单选题】Which of the following is a component of high powered money?
A.
bonds held by banks, loans, and bank reserves
B.
currency in circulation plus bank reserves
C.
currency in circulation plus checkable deposits
D.
bonds held by banks plus checkable deposits
【单选题】High-powered money minus reserves equals
A.
reserves.
B.
currency in circulation.
C.
the monetary base.
D.
the nonborrowed base.
【单选题】A 'base' or 'high-powered' money is distinguished from other types of money by the fact that it
A.
always consists of central-bank liabilities
B.
always consists of assets that can serve as commercial bank cash reserves
C.
always consists of gold coin
D.
must be a 'fiat' money
【简答题】基础货币(monetary base)和高能货币(high-powered money)
【简答题】As it was powered on, the machine began to work at high speed .
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