20-cm管 （312） 20

4 mins 18 secs

4 mins 50 secs

1 min 6 secs

10 secs

7 mins 57 secs

4 secs

8 mins 7 secs

38 secs

50 secs

27 mins 5 secs

40 secs

2 mins 58 secs

5 mins 55 secs

8 mins 12 secs

27 secs