7a5 by Trinh ThanhVân https://padlet.com/trinhthanhvan1989/4obfqe3mzzeb11wh en-us 2021-09-07 02:23:50 UTC 2025-04-14 13:55:30 UTC hello@padlet.com Thí nghiệm số 1: hai ống nhựa https://padlet.com/trinhthanhvan1989/4obfqe3mzzeb11wh/wish/2006016410 2022-01-22 02:40:19 UTC https://padlet.com/trinhthanhvan1989/4obfqe3mzzeb11wh/wish/2006016410