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一批作业（指一张调车作业通知单）不超过3钩或变更计划不超过3钩时，可用口头方式布置调车计划吗？
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【单选题】Suppose that the marginal propensity to consume is 0.8, and investment spending increases by $100 billion. The increase in aggregate demand is:
A.
$100 billion, the amount of investment spending.
B.
$125 billion, composed of $100 billion in investment spending and $25 billion in consumption.
C.
$80 billion, composed of $100 billion in investment spending and a decrease in consumption of $20 billion.
D.
$500 billion, composed of $100 billion in investment spending and $400 billion in consumption.
【单选题】The savings–investment spending identity says that:
A.
each person in the economy must invest as much as he or she saves.
B.
savings and investment spending are always equal for the economy as a whole.
C.
savings must equal government investment for the economy as a whole.
D.
each person in the economy must save as much as he or she invests.
【单选题】According to the savings–investment spending identity:
A.
savings and investment spending are always equal for the economy as a whole.
B.
for long-run economic growth savings must be more than investment spending.
C.
for long-run economic growth savings must be less than investment spending.
D.
the identity of savers and investors is important for encouraging long-run economic growth.
【单选题】单项数列中,某组的向上累计次数是 80,这表示总体中( )
A.
低于该组标志值的单位有 80个
B.
等于该组标志值的单位有 80个
C.
等于和低于该组标志值的单位有 80个
D.
高于该组标志值的单位有 80个
【单选题】According to the author, investment spending at last may result in ______.
A.
decrease of salaries
B.
lower living qualities
C.
higher standard of living
D.
reduction in consumer spending
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