Research shows that the intrinsic frequency of hole defect lumbers is little lower than standard lumbers.

研究表明,含有孔洞试件的固有频率与标准试件相比略低一些,但差别不大.

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The intrinsic frequency of molecular - vibration of nonmetal binary hydrides is calculated with vibration theory.

提出了非金属二元氢化物分子振动固有频率的计算原理与方法.

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