Water waves on the surface of a lake C. Waves in a slinky spring D. Seismic P-waves 相关知识点: 试题来源: 解析 B。水面上的水波是横波的例子。选项 A,空气中的声波是纵波。选项 C,弹簧中的波可以是纵波也可以是横波,不一定。选项 D,地震中的 P 波是纵波。反馈 收藏 ...
where vc stands for circumferential speed, r for rotor radius, and nr for the number of revolutions in a certain time interval. In an engineering context, frequently differential or partial differential equations are used, such as the governing differential equation of motion for the transverse vibr...