研究了具有弹性夹层的层板结构的振动特性.The vibration behaviour of sandwich structure with spring interlayer is studied.导出了双层板 ― 性夹层的综合单元刚度矩阵.The stiffness matrix of synthetic dual plate - spring interlayer element is deduced.型主动脉夹层的治疗——腔内修...
Some solitary bees make their nests in burrows in the soil.一些独居蜂会把巢筑在田间的地洞里。The intertidal beach unit contains some organism burrows.潮间海滩单元含有一些生物潜穴.A mole burrows its way through the ground.鼹鼠会在地下钻洞前进....