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【简答题】
同一个两个互相平行的轴上的()相等。若两个同一轴上的投影相等,这两个力不一定(),可能方向()。
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【简答题】China is the home of tea, has more than 4,000 years of history. People in China drink tea daily. the three major drinks ––tea, coffee and cocoa, tea is by the largest number of people in the world. Te...
【简答题】China is the home of tea. It more than 4,000 years of history. People in China drink tea daily. the three major drinks ----tea, coffee and cocoa（可口茶）, tea is drunk by people in the world. Over a thous...
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