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【多选题】
甩挂运输优势不包括？A.
车辆运行效率大幅提升
B.
运输成本明显降低
C.
节能减排效果明显
D.
运输组织简单化
E.
推动多式联运发展
F.
节省了人员成本
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举一反三
【单选题】(Figure: Strawberries and Submarines) Suppose the economy is operating at point G. This implies that:
A.
the economy can move to a point such as C only if it improves its technology.
B.
the economy is experiencing unemployment and/or inefficient allocation of resources.
【简答题】太阳系是一近似惯性系，其中观测者S测到距他3×10 9 1.y.(光年)处有一星云正以恒速0.60c离去.设这时在此星云中诞生一星体S'，其固有寿命为10×10 9 a(年).试问相对于S来说，①星体S'的寿命多长?②S'死亡时离5多远?③S接收来自S'的光，会持续多久?
【单选题】Suppose an economy's expenditures are equal to $7,000 billion. Income in the economy is
A.
less than $7,000 billion.
B.
more than $7,000 billion.
C.
exactly $7,000 billion.
D.
Somewhere between $7,000 billion and $8,000 billion.
【简答题】In the figure, suppose the economy is at point D. If the Fed eases to fight the recession, the economy will move toA. point A. B. point B. C. point C. D. Either point A or point C, depending on precis...
【单选题】In the figure, suppose the economy was initially in an equilibrium at point D. Where would the economy move if the Fed makes an open market purchase of government securities?
A.
B.
C.
D.
D, that is, the economy would not change its equilibrium.
【单选题】Suppose that an economy is in an inflationary gap in the short run. In the long run:
A.
. the economy's self-correcting mechanism will restore GDP to its potential level.
B.
. inflation will spiral unless the government takes dramatic fiscal measures.
C.
. sustained inflation will reduce the value of money.
D.
. fiscal and monetary policies may lower prices, but output will remain higher than potential level.
【多选题】在恒星起源过程中【 】
A.
恒星起源于星际空间存在的由气体和尘埃组成巨大分子云
B.
死亡恒星爆发向星际空间抛射,形成的星际弥漫物质成为新一代恒星产生场所
C.
刚诞生恒星常常在大星云中成群结队地出现说明恒星是由大星云碎裂后的小星云碎片形成
D.
昴星团中有许多7000万年前才从星云中诞生的年轻恒星,现在仍然被星云包围着
【单选题】Suppose the economy is in a short-run equilibrium, where the actual output is greater than potential output, then the economy is in:
A.
an inflationary gap, nominal wages will increase and SRAS will shift to the left until the actual GDP is equal to the potential GDP in the long run.
B.
a recessionary gap, nominal wages will decrease and AD will shift to the left until the actual GDP is equal to the potential GDP in the long run.
C.
an inflationary gap, prices of goods will increase and AD will shift to the right until the economy is in long-run equilibrium.
D.
a recessionary gap, prices of goods will decrease and LRAS will shift to the left until the economy is in long-run equilibrium.
【单选题】Suppose the economy is running at the level of potential GDP, an increase in government spending in the long run will ______ the price level and ______ the output level.
A.
increase, not change
B.
increase, increase
C.
increase, decrease
D.
decrease, increase
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