某拦河大坝横截面是个面积为225平方米的梯形，它的上底为12米，下底为18米，这拦河大坝的高为_1米．

题干

某拦河大坝横截面是个面积为225平方米的梯形，它的上底为12米，下底为18米，这拦河大坝的高为____米．

上一题下一题 0.0难度选择题更新时间:2019-03-10 09:06:23

15

Plan for this trip

Sunday	Lily has a rest in the hotel. John and Tom go to visit their Chinese friends.
Monday	Lily, John and Tom go to the Great Wall.
Tuesday	Lily and John go shopping. Tom watches TV in the hotel.
Wednesday	Lily, John and Tom go to the Palace Museum.
Thursday	Lily and Tom go to Tian'anmen Square. John goes to the movie theatre to watch a movie.
Friday	Lily and her Chinese friend go shopping. John and Tom go to the zoo.
Saturday	Lily, Tom and John leave China and go back to the U. S.