The threshold of no damage is project specific, but can quite probably be significantly higher than 0.3 g for properly designed and constructed concrete gravity and arch dams.

不遭受毁坏的的限度是因不同大坝工程而异，但是在设计和建筑大坝时最好把可能的限度定为0.3g。

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Methods:Dynamic CT scan was performed in 9 volunteers, measuring the CT value of the same plane of aortic arch and the theoretical threshold was obtained by the time density curve(TDC).

方法：9例志愿者行主动脉弓同层动态增强扫描，利用获得的主动脉弓时间-密度曲线（TDC），寻求触发技术的理论阈值。

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