velocity是rate of change of displacement
speed是 rate of change of distance
也就是说velocity是有方向的
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[讨论]spm science |
我想问你我们做sc的essay题目 有什么要注意的
hypothesis
variabe
aim
procedure
怎么写??
还有11、1 ...
catherine0205 发表于 2012-10-12 01:10 PM
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