A conserved quantity is a big deal in math and physics.
所有跟帖:
• 你说的对,但是相对我说的不responsive啊。 -Francine- ♀ (0 bytes) () 12/24/2017 postreply 13:11:16
• Whether the energy is positive or negative depends on where one -BeLe- ♀ (65 bytes) () 12/24/2017 postreply 13:14:13
• 你说的我懂(虽然你都没说完),可能我想多了,就把正负当进出吧,就行了。 -Francine- ♀ (0 bytes) () 12/24/2017 postreply 13:16:53