樓主: ronaldcheng
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一個簡單的考題考倒一大片! |
點評
我認為答案應(yīng)該是z2公轉(zhuǎn)一圈,,自轉(zhuǎn)兩圈,,你認為是3圈,我想應(yīng)該是你把題中“z1固定不動”理解成了“z1是可以自轉(zhuǎn)的‘,。
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