Much to the disappointment of the neighbouring countries, the Japanese government refuses to recognize _______ part they performed in _____ World War II in the history.

A．the; the                          B ×; the                        C．×; ×         D．the; ×

如图所示，粗细均匀的U形细玻璃管右端封闭，开口向下竖直放置，长L的横管中充满汞液，封住长L的右管中的气柱．不计温度变化，大气压强为P₀．今将管晃动后又静止在竖直位置时，发现汞柱可能向右管移动些，也可能向左管移动些，也可能恢复原状．试指出与前二类情况对应的L的值．