Which one is sky-wave propagation? ( )
举一反三
- Which one is sky-wave propagation? ( ) 未知类型：{'options': ['', '', ''], 'type': 102}
- Which one is sky-wave propagation? ( ) A: [img=349x171]18032253508af74.png[/img] B: [img=363x137]180322535baed08.png[/img] C: [img=372x202]1803225366a67f8.png[/img]
- Which one is sky-wave propagation? ( ) A: [img=349x171]180366f4d015b23.png[/img] B: [img=363x137]180366f4db04345.png[/img] C: [img=372x202]180366f4e6d30e7.png[/img]
- Which one is sky-wave propagation? ( ) A: [img=349x171]18038cd871b6bc7.png[/img] B: [img=363x137]18038cd87cacc57.png[/img] C: [img=372x202]18038cd88818e30.png[/img]
- In a ( ), the oscillations are perpendicular to the direction in which the wave travels. An example is a wave on a string. A: transverse wave B: longitudinal wave