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【简答题】
（本题12分）设等差数列第1024，第25-21 （1）求这个数列的通项公式；（2）设为其前n项和，求使取最大值时的n值。
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举一反三
【单选题】Which of the following statement is not true according to the passage?
A.
We should pity such unhappy people.
B.
Such unhappy people are Critical about everything.
C.
If such unhappy people recognize the bad effects of the habit on themselves they may get rid of it.
D.
Such unhappy people are also not content with themselves.
【简答题】如果想启动设备,接通设备中所有的电源,应该接通KM1和KM2,然后打开( ),再按下( )。(填写数字) X射线电源的断开是由( )控制。(填写数字) 设备调试或者检修情况,按下( )(填写数字)
【简答题】We should also remember to praise_______
【单选题】We should praise such diligent students Tom and Mary.
A.
like
B.
as
C.
who are
D.
that is
【单选题】The courage (we desire) and (praise) is not the courage to die (decently) but to live (manly).
A.
we desire
B.
praise
C.
decently
D.
manly
【简答题】如果想启动设备,接通设备中所有的电源,应该接通KM1和KM2,然后打开( ),再按下( )。(填写数字) X射线电源的断开是由( )控制。(填写数字) 设备调试或者检修情况,按下( )(填写数字)
【简答题】We should also remember to praise ______
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