1-1 挖掘机静态说明  
https://www.youtube.com/channel/UCi6JXdwaumcbx7kvFYmCwWw/videos

1-2



1-3


1-1 挖掘机静态检查1




1-2



1-3


1-4 宜兰  https://www.youtube.com/channel/UCvDaFAgRsxfriL_rWNIWcqA/videos