得出，当激振点不变时，激振力级的变化与振动模态辐射的平均声压级成线性关系；
When the exciting force was constant the average level of sound radiation produced by modal vibration has a linear relationship with the level of mode shapes.
基于泥沙运动的起动和止动条件分析了悬移质泥沙和床沙交换的内在机理，并根据这一机理推求了冲淤平衡状态下悬移质挟沙力级配的计算公式。
In terms of this mechanism, the calculation formula for the suspended load sediment-carrying capacity graduation under the balanced state of silting and scoring is deduced.
四川破坏力极强的7.9级地震导致中国西部约9万人死亡。
The devastating 7.9 magnitude Sichuan earthquake which killed about 90,000 people in western China.
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