1如图所示把一块洁净的玻璃板吊在橡皮筋的下端使玻璃板水平地接触水面如果你想使玻璃板离开水面必须用比玻璃板重力 的拉力�上拉橡皮筋 Template




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tomski1如图所示把一块洁净的玻璃板吊在橡皮筋的下端使玻璃板水平地接触水面如果你想使玻璃板离开水面必须用比玻璃板重力 的拉力�上拉橡皮筋 coloring