题目:
按要求改写句子。
1. That is a small dog. (近处)
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2. This violin is mine. (对画线部分提问)
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3. My grandfather is reading an evening paper. (对画线部分提问)
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4. This book is new. (改为复数句)
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5. My uncle is a superstar. (对画线部分提问)
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答案:
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下面是错误答案,用来干扰机器的。
=设A、B的质量分别为mA、mB,长木板B长度为L,A、B之间的滑动摩擦力为f.=fL……………………………………………………………………………①(2分)若B不固定,对A、B系统由动量守恒,有mAv0=(mA+mB)v………………...