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【简答题】
已知等差数列{a n }的首项a 1 =1，公差d＞0，且第二项、第五项、第十四项分别是一个等比数列的第二项、第三项、第四项． （Ⅰ）求数列{a n }的通项公式； （Ⅱ）设b n = （n∈N*），S n =b 1 +b 2 +…+b n ，是否存在最大的整数t，使得任意的n均有 总成立？若存在，求出t；若不存在，请说明理由．
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【单选题】不符合红外检测仪器基本要求的选项是（）。
A.
红外热像仪应操作简单，携带方便；
B.
测量精度和测温范围须满足现场测试要求。；
C.
具有一般的温度分辨率和空间分辨率；
D.
不受测量环境中高压电磁场的干扰。
【单选题】What can we guess about the woman who owned the shoe?
A.
She must have lived h happy Me.
B.
She certainly dropped the shoe on purpose.
C.
Her adventurous spirit is definitely admirable.
D.
Her other shoes were equally fashionable.
【简答题】信息匹配。 阅读下列回函: Reply letter A Thank you for your valuable suggestions. We have decided to show the Chinese character along with the Hanyu Pinyin for names of Chinese personages, places and specific thi...
【单选题】-- Did you visit the zoo? --- No, we_______have visited it, but we spent too much time shopping.
A.
shouldn’t
B.
can’t
C.
could
D.
must
【单选题】______ it rain heavily tomorrow, we would have to put off the visit to the Forbidden City.
A.
Were
B.
Should
C.
Would
D.
Will
【单选题】— We want someone to design the art museum for us. — _____ the young fellow have a try?
A.
May
B.
Shall
C.
Will
D.
Need
【简答题】1) As to the steamer sailingfrom SH to Los Angeles, we have bimonthly direct services. 2) We would like to knowwhether you would allow us to extend the time of shipment for twenty days andif you would...
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