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一個(gè)簡(jiǎn)單的考題考倒一大片! |
點(diǎn)評(píng)
你去做個(gè)簡(jiǎn)單的實(shí)驗(yàn),兩個(gè)一元的硬幣,,一個(gè)不動(dòng),,另一個(gè)繞著他轉(zhuǎn),你看看動(dòng)的那個(gè)轉(zhuǎn)幾圈才能繞固定的一圈,!
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