对于理想弹性体来说，时间相似条件早已明确。
For an idealized elastic mass, similarity conditions for time has been established for a long time.
混凝土并非理想弹性体，不同测试方法中波的传播规律是不同的。
Concrete is not a ideal elastic material, and laws of wave propagation are not same with different wavelength.
混凝土并非理想弹性体，不同测试方法中波的传播规律是不同的。
Concrete is not a ideal elastic material, and laws of wave propagation are not same with different wavelength.
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