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问题 单项选择题

当降水深度超过()m时，应采用深井井点进行降水。

A.6m 

B.8m 

C.10m 

D.15m 

答案

参考答案：D

选择题

–Who is Jerry?

–_____? I saw you shaking hands with him at the meeting,

A．Don’t you meet him yet

B．Hadn’t you met him yet

C．Didn’t you meet him yet

D．Haven’t you met him yet
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填空题
已知f(x)=
1
1+x
，如f（1）表示x=1时，f(1)=
1
1+1
=
1
2
，f（2）表示x=2时，f(2)=
1
1+2
=
1
3
，求f(2012)+f(2011)+…+f(2)+f(1)+f(
1
2
)+…+f(
1
2011
)+f(
1
2012
)=______．
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