题干

用两个____去头去底进行组合,就可以制成一个简易水钟。

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                                                                                              七律·长征
                                                                                           红军不怕远征难,
                                                                                           万水千山只等闲。
                                                                                           五岭逶迤腾细浪,
                                                                                           乌蒙磅礴走泥丸。
                                                                                           金沙水拍云崖暖,
                                                                                           大渡桥横铁索寒。
                                                                                           更喜岷山千里雪,
                                                                                           三军过后尽开颜。