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1原题及原解答如图1(a)所示,有一竖直放置的左端封闭、右端足够长且开口向上的U形均匀玻璃管,管中以水银柱封闭一段长为l_0=15cm的空气柱,两边管中水银的长度分别是h_1=22.5cm,h_2=27.5cm,
1 original title and the original answer As shown in Figure 1 (a), there is a vertically placed left end closed, the right end of the long enough and open U-shaped uniform glass tube, the tube of mercury to close a length of l_0 = 15cm of air Column, both sides of the mercury tube length are h_1 = 22.5cm, h_2 = 27.5cm,