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问题 单项选择题

Он долго ничего не мог сказать ____.

A．от волнения

B．из волнения

C． по волнению

D．благодаря волнению

答案

参考答案：B

单项选择题

After gastric resection surgery, which of the following signs and symptoms would alert the nurse to the development of a leaking anastomosis

A. Pain, fever, and abdominal rigidity.
B. Diarrhea with fat in the stool.
C. Palpitations, pallor, and diaphoresis after eating.
D. Feelings of fullness and nausea after eatin
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解答题
已知函数{an}满足：a1=2t，t2-2tan-1+an-1an=0，n=2，3，4，…（其中t为常数且t≠0）．
（I）求证：数列{
1
an-t
}为等差数列；
（II）求数列{an}的通项公式；
（III）设bn=n•2nan，求数列{bn}的前n项和Sn．
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