OG13 DS 130和Diagnostic Test Ps 5 部分求助
DS 130. What is the volume of a certain rectangular solid?
(1) Two adjacent faces of the solid have areas 15 and 24, repectively.
(2) Each of two opposite faces of the solid has area 40.
答案最后选择C，但是我没有看懂解答中对于 Each of the two opposite faces 的解释，在我看来，应该是该长方体每两个相对面的面积均为40，而解答中是表示只有两个相对面的面积为40，可是这里的each该如何解释呢，请各位G友帮帮忙啦。
Diagnostic Test Ps 5.
A closed cylindrical tank contains 36π cubic feet of water and is filled to half its capacity. When the tank is placed upright on its circular base on level ground, the height of the water in the tank is 2 feet. When the tank is placed on its side on level ground, what is the height in feet, of the surface of the water above the ground.
答案是3，我在看最后解答的时候，不太明白为什么在只有一半体积也就是36π 的算式中带入高度时带入的是整个容器的高度4英尺而不是2英尺，如果是带入2 的话，那么这道题就没有正确答案了，但是如果带入4，答案很容易算出是选择3。我自己认为这道题目的条件给错了，不知道各位有什么看法，麻烦帮忙解答一下疑惑啦，谢谢啦！！ |
