video mô phỏng làm việc:
[video=youtube;XEZb-kl3fDI]http://www.youtube.com/watch?v=XEZb-kl3fDI&feature=player_embedded[/video] video mô phỏng lắp ghép:
[video=youtube;bFxIRXXMFaY]http://www.youtube.com/watch?v=bFxIRXXMFaY&feature=player_embedded[/video]
