In the following figure,which one is the threaded connection?
未知类型：{'options': ['', '', '', ''], 'type': 102}
未知类型：{'options': ['', '', '', ''], 'type': 102}
举一反三
- Which one is sky-wave propagation? ( ) 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 of the following indices can represent the degree of collaboration 未知类型：{'options': ['', '', '', ''], 'type': 102}
- Which of the following sets is a basis for[img=20x22]17de814512dc5c3.png[/img]. 未知类型：{'options': ['', '', '', ''], 'type': 102}
- Which of the two functions in each of the following groups are the same functions 未知类型：{'options': ['', '', '', ''], 'type': 102}