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【简答题】
The terrain of Xinjiang is described as "three mountains squeezing two basins", so please write down the names of the "three mountains" and the "two basins".
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反馈参考答案：
举一反三
【单选题】Which of the following is false of perfectly competitive firms?
A.
A perfectly competitive market is approximated in highly organized markets for securities and agricultural commodities.
B.
The perfectly competitive model does not require any knowledge on the part of individual buyers and sellers about market demand and supply curves.
C.
Because perfectly competitive firms are price takers, each firm's demand curve remains unchanged even when the market price changes.
D.
In a perfectly competitive market, marginal revenue is constant and equal to the market price.
【单选题】Which of the following is true of perfectly competitive firms?
A.
It is difficult for entrepreneurs to become suppliers of a product in a perfectly competitive market structure.
B.
A perfectly competitive firm has a perfectly elastic supply curve.
C.
In a perfectly competitive market, an individual seller can change his price and it will not alter the output he sells.
D.
None of the above are true.
【单选题】The perfectly competitive firm faces a demand curve that is ________ and ________:
A.
perfectly inelastic; vertical
B.
perfectly elastic; horizontal
C.
unitary elastic; slopping downward
D.
the same as the market demand for the product; vertical
【简答题】A．typically B．simply C．fairly D．perfectly
【简答题】回顾可持续发展的历史 6月5日~14日,联合国 于瑞典首都 召开,这次会议可以说是其中的第一座里程碑。 6月,联合国 在巴西召开,共有183个国家的代表团和70个国际组织的代表出席了会议,102位国家元首或政府首脑到会讲话。大会为人类的可持续发展矗立了一座重要的里程碑,使人类迈出了跨向新文明时代的关键性一步。
【单选题】A perfectly competitive firm faces a demand curve that is:
A.
horizontal and perfectly inelastic.
B.
horizontal and perfectly elastic.
C.
vertical and perfectly inelastic.
D.
vertical and perfectly elastic.
【单选题】The demand curve facing a perfectly competitive firm is:
A.
perfectly inelastic.
B.
perfectly elastic.
C.
unit elastic.
D.
downward sloping.
【单选题】若堆栈采用顺序存储结构，正常情况下，删除堆栈中一个元素，栈顶指针TOP的变化是(44)。
A.
不变
B.
TOP=0
C.
TOP=TOP+1
D.
TOP=TOP-1
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