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【判断题】
在不完全竞争条件下，书商为了增加发行量，价格统一从7060元，由此可知，与价格改变之前的销售相比，其每增加1本书的销售会增加60元的收益。A.
正确
B.
错误
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举一反三
【简答题】编程:显示如下菜单 用户输入选项后,输出用户的选择结果。
【单选题】Which one of these is not newspaper?
A.
The New York Times
B.
The Washington Post
C.
The Sun
D.
The Declaration of Independence
【单选题】Which one of these is not newspaper?
A.
The New York Times 《纽约时报》
B.
The Washington Post 《华盛顿邮报》
C.
The Sun 《太阳报》
D.
The Declaration of Independence 《独立宣言》
【单选题】Which one of these statements is true?
A.
Amygdala is responsible for focuing on positive information.
B.
The orbitofrontal cortex is responsible for behaving relatively properly.
C.
Temporoparietal juction in the left hemisphere is associated with making inferences about other people's mental states.
D.
When it comes to reasoning about other people, funtion of MPFC (medial prefrontal cortex) is limited to determine other's mental states.
【多选题】Which one of these are Scottish inventions?
A.
universal standard time
B.
RADAR
C.
ATM
D.
PIN
E.
the theory of electromagnetism
F.
Higgsboson
G.
Penicillin
【简答题】为防止河水对边坡、坡脚和坡脚处地基不断的冲刷和淘刷。应设()。
【简答题】设双曲线的顶点为（0，±1），该双曲线又与直线 15 x-3y+6=0 交于A，B两点，且OA⊥OB（O为坐标原点）． （1）求此双曲线的方程； （2）求|AB|
【简答题】设双曲线的顶点为 ，该双曲线又与直线 交于 两点，且 （ 为坐标原点）。 （1）求此双曲线的方程； （2）求
【单选题】Which one of these statements is correct?
A.
Investors earn a return called a spread
B.
Dealers pay a fee, called the spread, to brokers
C.
Investors sell at the ask price
D.
Dealers buy at the bid price
E.
Brokers maintain an inventory of securities
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