The conventional supersonic detection of concrete is impossible to be accomplished due to the dynamic failure process which results in the deformation of tested surface.
但在荷载作用下混凝土的破坏是一个动态过程，由于测试面发生变形，使常规超声波测试无法完成。
With them the process of units work, failure, repair and renovation is described, sequentially the dynamic failure and availability of the units can be computed under the influence of the repair time.
构造了元件故障向量、维修向量、故障频率序列和修复序列，并利用其运算描述了元件的工作、故障、维修和修复过程，从而计算出在事后维修方式和维修时间分布影响下的元件动态可靠性指标：故障频率，有效度。
In terms of its manifestations, it can be divided into two types: static academic failure, namely, academic failure as a result and dynamic academic failure, namely, academic failure as a process.
根据其表现的状况，它可分为静态的学业失败即结果性学业失败，和动态的学业失败即过程性学业失败。
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