读等高线示意图,完成26~27题。 26.图示区域内最大高差可能为  

读等高线示意图,完成2627题。

26.图示区域内最大高差可能为

     A50m        B55m       C60m         D65m

27.图中①②③④附近河水流速最快的是

     A①    B②  C③    D.④

答案

  CC

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