The experiment error of sound velocity measuring is very small with lissajous figures.
用李萨如图形法测量声速误差较小。
The result showed the experiment error was allowable to laboratory apparatus and proved Bernoulli equation.
结果显示：实验误差在设备装置允许的范围内，从而验证了柏努利方程。
The experiment error which altering barycenter of sand pendulum brings about is analyzed theoretically. And it is also an important factor comparing with others.
从实验误差理论角度，分析了沙摆重心变化引起的实验误差，结果表明由重心变化引起的误差相对于其它误差而言在实验中占主要地位。
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