讨论了弹性波多普勒效应的叠加性质，并指出相对论的时间膨胀和长度收缩对弹性波多普勒效应的影响。

The superposition property of elastic wave's Doppler effect and the influence of relativistic time dilation and length contraction on elastic wave's Doppler effect are also discussed.

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该法把时间分割为若干时间段，求解各段因收缩、徐变和松弛引起的预应力损失，并叠加求总损失。

With the time being separated into some periods, the prestressing loss in each period due to shrink, creep and relaxation is calculated, and then the total loss obtained.

youdao

该法把时间分割为若干时间段，求解各段因收缩、徐变和松弛引起的预应力损失，并叠加求总损失。

With the time being separated into some periods, the prestressing loss in each period due to shrink, creep and relaxation is calculated, and then the total loss obtained.

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