8191| 24
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求能把重力勢能轉(zhuǎn)化成動能的機(jī)構(gòu) |
評分
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點(diǎn)評
用機(jī)械的方式,肯定可以,但是就復(fù)雜了而且,就算你能讓小車運(yùn)動容易實(shí)現(xiàn),但是想讓它勻速運(yùn)動也有難度,
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