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何谓梁的材料抵抗弯距图?
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【简答题】已知数列 为等比数列，且 ，设等差数列 的前 项和为 ，若 ，则
【单选题】Which of the following cases contains an element that may lead a politician to correct cognitive dissonance? ( )
A.
A politician does not really care if the spotted owl lives or becomes extinct.
B.
The politician has the power to pass legislation to keep the spotted owl from extinction.
C.
The politician will get re-elected for ignoring the needs of the spotted owl.
D.
The politician grew up in the city.
【简答题】A．skilled B．mental C．manual D．mechanical
【多选题】Choose the following sentences if you think that "serve" has the same meaning as "satisfying".
A.
But the study shows that principal among them is the work of library staff to serve the information needs of the communities.
B.
This could mean the closure of thousands of small businesses which serve the community.
C.
Almost no politician in the US runs for office without begging huge campaign funds from the rich – so when they are elected, they must serve their interests, not ordinary Americans’.
D.
Leo is currently serving a life sentence for murder.
【简答题】已知数列 为等比数列，且 ，设等差数列 的前 项和为 ，若 ，则 .
【简答题】设等差数列 的前 项和为 ，若 ，则 ．
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