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某轴流式水轮机KR＝2.4，水轮机额定转速为300rpm，求该水轮机的最大飞逸转速为多少？

答案

参考答案：

nFmax＝KRne＝2.4×300＝720（r／min）

答：该水轮机的最大飞逸转速为720r／min。

完形填空

用方框中所给单词的适当形式填空，使短文通顺、正确、连贯（每个单词限用一次）。

final   through  many   quick   pay  hand  please   because  come   hear

It was a dark cool night. The car driver didn’t have even one passenger all day. When he drove near the railway station, he saw a young man___小题1:___out with two bags in his___小题2:__.So he stopped ___小题3:__ to open the door of the car and asked, “Where do you want to go, sir?” “To Star Hotel.” The young man answered. When the car driver___小题4:___that, he didn’t feel___小题5:___.

The young man would give him only three dollars___小题6:__ the hotel was near the railway station. But suddenly he had an idea. He took the passenger___小题7:____many streets of the city.

After a long time, the car___小题8:_____ arrived at the hotel. “You should give me fifteen dollars.” The car driver said to the young man. “ What! Fifteen dollars? Only last week I took car from the railway station to this same hotel and I only____小题9:___the driver thirteen dollars. I know how __小题10:____I have to pay for the car.
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问答题

将函数展开为x+4的幂级数，并求此级数的收敛域．
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