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【简答题】
设函数f（x）对于任意x，y∈R，f（x+y）=f（x）+f（y），f（1）=-2，则f（3）=______．
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举一反三
【单选题】Which of the following is one of the most popular sights at the Nuremberg “Christ Child” Christmas market?
A.
The church lights
B.
Christmas songs
C.
Firework displays
D.
The Nativity display
【单选题】几种常用的抽样方法，其误差的排列顺序正确的是( )
A.
分层抽样≥整群抽样≥单纯随机抽样≥系统抽样
B.
分层抽样≥单纯随机抽样≥系统抽样≥整群抽样
C.
整群抽样≥单纯随机抽样≥系统抽样≥分层抽样
D.
系统抽样≥单纯随机抽样≥整群抽样≥分层抽样
E.
单纯随机抽样≥系统抽样≥整群抽样≥分层抽样
【单选题】Which of the following is not mentioned about the Nuremberg “ Christ Child ” Christmas market in this video clip?
A.
The opening ceremony of the market.
B.
The origin of the market.
C.
The items sold in the market.
D.
The attractive displays in the market.
【单选题】Britain has the following papers except ______.
A.
The Daily Telegraph
B.
The Guardian
C.
Christian Science Monitor
D.
The Times
【单选题】Britain has the following papers except ______.
A.
The Daily Telegraph
B.
The Guardian
C.
Christian Science Monitor
D.
The Times
【单选题】Which of the following is not mentioned about the Nuremberg “Christ Child” Christmas market in this clip?
A.
The opening ceremony of the market
B.
The origin of the market
C.
The items sold in the market
D.
The attractive displays in the market.
【单选题】Which among the following is kept to commemorate the resurrection of Jesus Christ?
A.
Good Friday.
B.
Christmas Day.
C.
Holy Saturday.
D.
Easter.
【单选题】各种抽样方法的抽样误差一般是( )。
A.
单纯随机抽样≥整群抽样≥系统抽样≥分层抽样
B.
整群抽榉≥系统抽样≥单纯随机抽样≥分层抽样
C.
整群抽样≥单纯随机抽样≥系统抽样≥分层抽样
D.
分层抽样≥单纯随枧抽样≥系统抽样≥整群抽样
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