题干
句子配对。
① How does the paper feel? ____ A. It's water.
② Do you like winter or summer?____ B. It's soft.
③ Taste it. Is it milk or water?____ C. I like winter.
④ How do the grapes taste? ____ D. It's ice.
⑤ It feels hard and cold. What is it?____ E. They are sweet.
答案(点此获取答案解析）
B,C,A,E,D
-
=1(a>0,b>0)的焦点，而且被该双曲线的右准线分成的弧长为2∶1的两段圆弧，那么该双曲线的离心率e等于
的同侧，为了方便灌溉农作物，要在河边建一个抽水站，将河水送到A、B两地。问该站建在河边什么地方，可使所修
的渠道最短？试
在图中确定该点。（保留作图痕迹）
