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第1题

There seems never to have been a civilization without toys, but when and how they developed is unknown. They probably ca
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第2题

Long after the 1998 World Cup was won, disappointed fans were still cursing the disputed refereeing (裁判)decisions that d
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第3题

“32位微机”中的32指的是（ ）
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第4题

请说出你知道的弹簧的几种作用
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