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【简答题】
用方框中所给单词的适当形式填空。 nod use care prevent excellent 1. We should use both sides of paper and _______ plastic bags. 2. Forests can _______ the water from washing the earth away. 3. I asked Mrs. Wang if she would help. She agreed and _______. 4. Qian Xuesen is one of the most _______ scientists in the world. 5. The more _______ you describe it, the more easily we can understand.
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【简答题】如何判断轴是否承受弯矩?( )
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