L13_A
How does a rotating top maintain its balance?
L13_B
How does a rotating top maintain its balance?
Array ( [0] => Array ( [title] => L13A [link] => https://www.youtube.com/embed/6jPG5s68_Lg ) [1] => Array ( [title] => L13B [link] => https://www.youtube.com/embed/LzZGgy9Mpug ) )
Title
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第2節
Syllabus
L13_A
How does a rotating top maintain its balance?
L13_B
How does a rotating top maintain its balance?