Which one is sky-wave propagation? ( )
未知类型：{'options': ['', '', ''], 'type': 102}
未知类型：{'options': ['', '', ''], 'type': 102}
举一反三
- Which one is sky-wave propagation? ( )
- In the following figure,which one is the threaded connection? 未知类型：{'options': ['', '', '', ''], 'type': 102}
- Which one of the followings is NOT the criteria of strong inversion? 未知类型：{'options': ['', '', '', ''], 'type': 102}
- Which one of the followings is the correct stroke order of the Chinese character “永”? 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]