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【多选题】
以下属于控制病例对照研究混杂偏倚的措施是A.
采用匹配方式选择对照
B.
使调查员不知道研究的假设
C.
对研究对象的人选条件进行控制
D.
分层分析法计算OR值
E.
进行多因素Logistic回归分析
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举一反三
【简答题】Calculate the social welfare under perfect competition. Compared with perfect competition, calculate the dead weight loss under the Cournot competition?
【单选题】Which of the following is not true in the long run under perfect competition?
A.
There is no incentive for firms to enter or exit the industry.
B.
Economic profit is zero.
C.
Long-run marginal cost is minimized.
D.
Long-run average total cost is minimized.
【单选题】The bike under the tree ________ belong to Hilary. Look! Her bag is on it.
A.
must
B.
shall
C.
will
D.
Can
【单选题】Under perfect capital mobility and fixed exchange rates, expansionary _____ is especially effective because the _____.
A.
fiscal policy; LM curve effectively is vertical.
B.
monetary policy; LM curve effectively is the same as the FE curve.
C.
fiscal policy; interest rate does not change.
D.
monetary policy; interest rate does not change.
【单选题】In long-run equilibrium under perfect competition
A.
price will equal minimum average fixed cost.
B.
firms will earn economic profits due to the existence of barriers to entry.
C.
the demand curve facing individual firms will fall to the level tangent to the minimum average total cost curve.
D.
firms will produce at the level of output where marginal revenue exceeds marginal cost by the greatest dollar amount.
【单选题】Where are the basketballs?
A.
On the table．
B.
Behind the door．
C.
Under the table．
D.
In the． drawer．
【简答题】等效平面简化法 常用简化方法有()。
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