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【单选题】
某企业所面临的需求曲线具有完全价格弹性,则( )A.
它可以通过提价来扩大需求量
B.
它可以通过提价来减少总收益
C.
平均收益曲线向右下方倾斜
D.
它的边际收益等于产品价格
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【简答题】Please send my best wishes when you ______ (meet) him.
【简答题】大气污染的种类及主要来源有哪些?
【单选题】听力原文：W: Goodbye, John. And please send my regards to your parents. M: Sure I will. Thank you very much. Bye. What did the woman ask the man to do?
A.
To give her some presents.
B.
To give her his parents.
C.
To give her best wishes to his parents.
【单选题】---Please send my best wishes to your family. ---______!
A.
You too
B.
Thank you
C.
Me too
D.
The same to you
【单选题】听力原文：W: Goodbye, John. And please send my regards to your parents. M: Sure I will. Thank you very much. Bye. What did the woman ask the man to do?
A.
To give her some presents.
B.
To give some presents to his parents.
C.
To give her best wishes to his parents.
【单选题】Please send ______ my best wishes when you go to visit your grandparents.
A.
their
B.
they
C.
them
D.
theirs
【单选题】筛检或诊断试验的可靠性是指:
A.
观察者对结果判断的一致程度
B.
重复多次试验获得相同结果的稳定程度
C.
受试者的测定值与实际值的符合程度
D.
试验结果中真正有无疾病的概率
E.
以上均不正确
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